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x(30-2x)(20-2x)=1500
We move all terms to the left:
x(30-2x)(20-2x)-(1500)=0
We add all the numbers together, and all the variables
x(-2x+30)(-2x+20)-1500=0
We multiply parentheses ..
x(+4x^2-40x-60x+600)-1500=0
We multiply parentheses
4x^3-40x^2-60x^2+600x-1500=0
We do not support expression: x^3
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