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x(3x-19)(3x-19)=4x
We move all terms to the left:
x(3x-19)(3x-19)-(4x)=0
We add all the numbers together, and all the variables
-4x+x(3x-19)(3x-19)=0
We multiply parentheses ..
x(+9x^2-57x-57x+361)-4x=0
We multiply parentheses
9x^3-57x^2-57x^2+361x-4x=0
We do not support expression: x^3
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