Simplify. $$ 5 a+4 b-3 a= $$ $$ 6 x^{2}-8 x^{2}-5 x= $$ $$ x+7 x+5= $$ $$ 6 a b-8 a b+4 a b= $$ $$ 7 x-8 y-3 x+10 y= $$ $$ x^{2}+3 x+4+x^{2}+2 x-6= $$ $$ a+7-4+3 a+a-2 a= $$ $$ 6 a+4 b-3 c-6 b= $$ $$ 4 x^{3}-2 x\left(10 x^{2}-3 x^{2}\right)= $$ $$ (a+4 a)-2(6 a-10 a)= $$ $$ 5 x+7+3(x-7)= $$

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Here are the simplified forms of the given expressions:

1. $$5a + 4b - 3a = 2a + 4b$$

2. $$6x^{2} - 8x^{2} - 5x = -2x^{2} - 5x$$

3. $$x + 7x + 5 = 8x + 5$$

4. $$6ab - 8ab + 4ab = 2ab$$

5. $$7x - 8y - 3x + 10y = 4x + 2y$$

6. $$x^{2} + 3x + 4 + x^{2} + 2x - 6 = 2x^{2} + 5x - 2$$

7. $$a + 7 - 4 + 3a + a - 2a = 3a + 3$$

8. $$6a + 4b - 3c - 6b = 6a - 2b - 3c$$

9. $$4x^{3} - 2x\left(10x^{2} - 3x^{2}\right) = 4x^{3} - 2x(7x^{2}) = 4x^{3} - 14x^{3} = -10x^{3}$$

10. $$(a + 4a) - 2(6a - 10a) = 5a - 2(-4a) = 5a + 8a = 13a$$

11. $$5x + 7 + 3(x - 7) = 5x + 7 + 3x - 21 = 8x - 14$$
Here are the simplified forms of the given expressions: 1. $$2a + 4b$$ 2. $$-2x^{2} - 5x$$ 3. $$8x + 5$$ 4. $$2ab$$ 5. $$4x + 2y$$ 6. $$2x^{2} + 5x - 2$$ 7. $$3a + 3$$ 8. $$6a - 2b - 3c$$ 9. $$-10x^{3}$$ 10. $$13a$$ 11. $$8x - 14$$

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