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x(30-2x)(24-2x)=1040
We move all terms to the left:
x(30-2x)(24-2x)-(1040)=0
We add all the numbers together, and all the variables
x(-2x+30)(-2x+24)-1040=0
We multiply parentheses ..
x(+4x^2-48x-60x+720)-1040=0
We multiply parentheses
4x^3-48x^2-60x^2+720x-1040=0
We do not support expression: x^3
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