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90=(7x+6)
We move all terms to the left:
90-((7x+6))=0
We calculate terms in parentheses: -((7x+6)), so:We get rid of parentheses
(7x+6)
We get rid of parentheses
7x+6
Back to the equation:
-(7x+6)
-7x-6+90=0
We add all the numbers together, and all the variables
-7x+84=0
We move all terms containing x to the left, all other terms to the right
-7x=-84
x=-84/-7
x=+12
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