x2(20-x)=50

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Solution for x2(20-x)=50 equation: 



x2(20-x)=50

We move all terms to the left:

x2(20-x)-(50)=0

We add all the numbers together, and all the variables

x2(-1x+20)-50=0

We multiply parentheses

-1x^3+20x^2-50=0

We do not support expression: x^3

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