You can put this solution on YOUR website! 5x^3 does not=125x
(5x)^3=125x^3
(5^3)x=125x
5x^3=5(x^3)
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5x^3+2x^2-7x-3
-6x^2-3x+11 now add like terms.
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5x^3-4x^2-10x+7 answer.