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x(11-2x)(8.5-2x)=50
We move all terms to the left:
x(11-2x)(8.5-2x)-(50)=0
We add all the numbers together, and all the variables
x(-2x+11)(-2x+8.5)-50=0
We multiply parentheses ..
x(+4x^2-17x-22x+93.5)-50=0
We multiply parentheses
4x^3-17x^2-22x^2+93.5x-50=0
We do not support expression: x^3
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