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(15-2x)(15-2x)(x)=100
We move all terms to the left:
(15-2x)(15-2x)(x)-(100)=0
We add all the numbers together, and all the variables
(-2x+15)(-2x+15)x-100=0
We multiply parentheses ..
(+4x^2-30x-30x+225)x-100=0
We multiply parentheses
4x^3-30x^2-30x^2+225x-100=0
We do not support expression: x^3
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