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126=(3x+90)
We move all terms to the left:
126-((3x+90))=0
We calculate terms in parentheses: -((3x+90)), so:We get rid of parentheses
(3x+90)
We get rid of parentheses
3x+90
Back to the equation:
-(3x+90)
-3x-90+126=0
We add all the numbers together, and all the variables
-3x+36=0
We move all terms containing x to the left, all other terms to the right
-3x=-36
x=-36/-3
x=+12
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