Answer:
6x+5
Explanation:
(8x^2-5x-7)-(9x^2-3x-5)+(x+7)(x+1)=
8x^2-5x-7-9x^2+3x+5+x*x+x*1+7*x+7*1=
-x^2 - 2x-2+x^2 +x+7x+7=
-2x-2+8x+7=6x+5
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