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x(70)=58x-0.4x^2
We move all terms to the left:
x(70)-(58x-0.4x^2)=0
We add all the numbers together, and all the variables
x^70-(58x-0.4x^2)=0
We get rid of parentheses
x^70+0.4x^2-58x=0
We do not support expression: x^70
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