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90=x+(30x+10)
We move all terms to the left:
90-(x+(30x+10))=0
We calculate terms in parentheses: -(x+(30x+10)), so:We get rid of parentheses
x+(30x+10)
We get rid of parentheses
x+30x+10
We add all the numbers together, and all the variables
31x+10
Back to the equation:
-(31x+10)
-31x-10+90=0
We add all the numbers together, and all the variables
-31x+80=0
We move all terms containing x to the left, all other terms to the right
-31x=-80
x=-80/-31
x=2+18/31
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