3 Simplify $$ x^{2}+2 x-5+\left(-2 x^{2}\right)-(-4)+3 $$

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Calculate or simplify the expression $$ x^2+2x-5-2x^2+4+3 $$.
Simplify the expression by following steps:
- step0: Solution:
  $$x^{2}+2x-5-2x^{2}+4+3$$
- step1: Subtract the terms:
  $$-x^{2}+2x+2$$
The simplified expression is $$-x^{2}+2x+2$$.
The simplified expression is $$-x^{2}+2x+2$$.

3 Simplify

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