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(13-2x)(8.5-2x)(x)=
We move all terms to the left:
(13-2x)(8.5-2x)(x)-()=0
We add all the numbers together, and all the variables
(-2x+13)(-2x+8.5)x-()=0
We add all the numbers together, and all the variables
(-2x+13)(-2x+8.5)x=0
We multiply parentheses ..
(+4x^2-17x-26x+110.5)x=0
We multiply parentheses
4x^3-17x^2-26x^2+110.5x=0
We do not support expression: x^3
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