Add the following polynomials (Write answers in descending order): 1. $$ \left(7 j^{3}-2\right)+\left(5 j^{3}-j-3\right) $$ 2. $$ \left(8 a^{5}-4\right)+\left(3 a^{5}+a-2\right) $$ 3. $$ \left(6 m^{5}+1\right)+\left(2 m^{5}+9 m-1\right) $$ 4. $$ \left(3 m^{5}+1\right)+\left(9 m^{5}+3 m-2\right) $$ 5. $$ \left(-5 x^{2}-x+4\right)+\left(-3 x^{2}-5 x+2\right) $$ 6. $$ \left(-4 x+4 x^{3}+7\right)+\left(3 x^{3}-9-3 x\right) $$ 7. $$ \left(3 x^{2}-2 x+1\right)+\left(-x^{2}+3 x+1\right) $$

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Simplify the expression by following steps:
- step0: Solution:
  $$\left(6m^{5}+1\right)+\left(2m^{5}+9m-1\right)$$
- step1: Remove the parentheses:
  $$6m^{5}+1+2m^{5}+9m-1$$
- step2: Add the terms:
  $$8m^{5}+9m$$
Calculate or simplify the expression $$ (3 x^{2}-2 x+1)+(-x^{2}+3 x+1) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(3x^{2}-2x+1\right)+\left(-x^{2}+3x+1\right)$$
- step1: Remove the parentheses:
  $$3x^{2}-2x+1-x^{2}+3x+1$$
- step2: Subtract the terms:
  $$2x^{2}+x+2$$
Calculate or simplify the expression $$ (7 j^{3}-2)+(5 j^{3}-j-3) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(7j^{3}-2\right)+\left(5j^{3}-j-3\right)$$
- step1: Remove the parentheses:
  $$7j^{3}-2+5j^{3}-j-3$$
- step2: Add the terms:
  $$12j^{3}-5-j$$
Calculate or simplify the expression $$ (8 a^{5}-4)+(3 a^{5}+a-2) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(8a^{5}-4\right)+\left(3a^{5}+a-2\right)$$
- step1: Remove the parentheses:
  $$8a^{5}-4+3a^{5}+a-2$$
- step2: Add the terms:
  $$11a^{5}-6+a$$
Calculate or simplify the expression $$ (-5 x^{2}-x+4)+(-3 x^{2}-5 x+2) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(-5x^{2}-x+4\right)+\left(-3x^{2}-5x+2\right)$$
- step1: Remove the parentheses:
  $$-5x^{2}-x+4-3x^{2}-5x+2$$
- step2: Subtract the terms:
  $$-8x^{2}-6x+6$$
Calculate or simplify the expression $$ (3 m^{5}+1)+(9 m^{5}+3 m-2) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(3m^{5}+1\right)+\left(9m^{5}+3m-2\right)$$
- step1: Remove the parentheses:
  $$3m^{5}+1+9m^{5}+3m-2$$
- step2: Add the terms:
  $$12m^{5}-1+3m$$
Calculate or simplify the expression $$ (-4 x+4 x^{3}+7)+(3 x^{3}-9-3 x) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(-4x+4x^{3}+7\right)+\left(3x^{3}-9-3x\right)$$
- step1: Remove the parentheses:
  $$-4x+4x^{3}+7+3x^{3}-9-3x$$
- step2: Subtract the terms:
  $$-7x+7x^{3}-2$$
Here are the results of adding the given polynomials in descending order:

1. $$ 12j^{3} - 5 - j $$
2. $$ 11a^{5} - 6 + a $$
3. $$ 8m^{5} + 9m $$
4. $$ 12m^{5} + 3m - 1 $$
5. $$ -8x^{2} - 6x + 6 $$
6. $$ 7x^{3} - 7x - 2 $$
7. $$ 2x^{2} + x + 2 $$
1. $$ 12j^{3} - j - 5 $$ 2. $$ 11a^{5} + a - 6 $$ 3. $$ 8m^{5} + 9m $$ 4. $$ 12m^{5} + 3m - 1 $$ 5. $$ -8x^{2} - 6x + 6 $$ 6. $$ 7x^{3} - 7x - 2 $$ 7. $$ 2x^{2} + x + 2 $$

Add the following polynomials (Write answers in descending order):

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