Answer:
-x^2+5x
Explanation:
Okay. Let us start by underlining those like terms:
7x^2 - 5x +10x -8x^2
7x^2-8x^2 -5x+10x (I basically grouped the like terms together)
-x^2 +5x (I solved it in those groups)
-x^2+5x (answer)
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