Elementary Algebra

$-2x^{2}-2x+5$
Grouping like terms together and then adding/subtracting them together, we obtain: $(-7x^{2}+6x-2)+(5x^{2}-8x+7)$ =$(-7x^{2}+5x^{2})+(6x-8x)+(-2+7)$ =$(-2x^{2})+(-2x)+(5)$ =$-2x^{2}-2x+5$