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x(-3x+8)(-x-2)=63
We move all terms to the left:
x(-3x+8)(-x-2)-(63)=0
We add all the numbers together, and all the variables
x(-3x+8)(-1x-2)-63=0
We multiply parentheses ..
x(+3x^2+6x-8x-16)-63=0
We multiply parentheses
3x^3+6x^2-8x^2-16x-63=0
We do not support expression: x^3
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