Work Step by Step
We simplify by removing the parentheses and then add the like terms as follows: $$ (3x^2+ 7) + (6x - 7) + (2x^2 + 5x - 13) +(7x- 9)\\ =3x^2+ 7 +6x - 7 + 2x^2 + 5x - 13 +7x- 9\\ =5x^2+18x-22 .$$
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