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(12x+36)=(7x+81)
We move all terms to the left:
(12x+36)-((7x+81))=0
We get rid of parentheses
12x-((7x+81))+36=0
We calculate terms in parentheses: -((7x+81)), so:We get rid of parentheses
(7x+81)
We get rid of parentheses
7x+81
Back to the equation:
-(7x+81)
12x-7x-81+36=0
We add all the numbers together, and all the variables
5x-45=0
We move all terms containing x to the left, all other terms to the right
5x=45
x=45/5
x=9
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