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4x-8=-x(40-20)
We move all terms to the left:
4x-8-(-x(40-20))=0
We add all the numbers together, and all the variables
4x-(-x20)-8=0
We get rid of parentheses
4x+x20-8=0
We add all the numbers together, and all the variables
x^20+4x-8=0
We do not support expression: x^20
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