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(30-2x)(15-2x)x=0
We add all the numbers together, and all the variables
(-2x+30)(-2x+15)x=0
We multiply parentheses ..
(+4x^2-30x-60x+450)x=0
We multiply parentheses
4x^3-30x^2-60x^2+450x=0
We do not support expression: x^3
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