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$5 x + 4 \exponential{x}{2} (2 x + 7) - 6 x - 9 x $
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5x+8x^{3}+28x^{2}-6x-9x
Use the distributive property to multiply 4x^{2} by 2x+7.
-x+8x^{3}+28x^{2}-9x
Combine 5x and -6x to get -x.
-10x+8x^{3}+28x^{2}
Combine -x and -9x to get -10x.
5x+8x^{3}+28x^{2}-6x-9x
Use the distributive property to multiply 4x^{2} by 2x+7.
-x+8x^{3}+28x^{2}-9x
Combine 5x and -6x to get -x.
-10x+8x^{3}+28x^{2}
Combine -x and -9x to get -10x.