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7x-90=(x+20)
We move all terms to the left:
7x-90-((x+20))=0
We calculate terms in parentheses: -((x+20)), so:We get rid of parentheses
(x+20)
We get rid of parentheses
x+20
Back to the equation:
-(x+20)
7x-x-20-90=0
We add all the numbers together, and all the variables
6x-110=0
We move all terms containing x to the left, all other terms to the right
6x=110
x=110/6
x=18+1/3
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