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21x-21=5(x81+10)
We move all terms to the left:
21x-21-(5(x81+10))=0
We add all the numbers together, and all the variables
-(5(+x^81+10))+21x-21=0
We calculate terms in parentheses: -(5(+x^81+10)), so:
5(+x^81+10)
We do not support expression: x^81
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