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x(10-2x)(14-2x)=120.2
We move all terms to the left:
x(10-2x)(14-2x)-(120.2)=0
We add all the numbers together, and all the variables
x(-2x+10)(-2x+14)-(120.2)=0
We add all the numbers together, and all the variables
x(-2x+10)(-2x+14)-120.2=0
We multiply parentheses ..
x(+4x^2-28x-20x+140)-120.2=0
We multiply parentheses
4x^3-28x^2-20x^2+140x-120.2=0
We do not support expression: x^3
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