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90=6x+3(2x-6)
We move all terms to the left:
90-(6x+3(2x-6))=0
We calculate terms in parentheses: -(6x+3(2x-6)), so:We get rid of parentheses
6x+3(2x-6)
We multiply parentheses
6x+6x-18
We add all the numbers together, and all the variables
12x-18
Back to the equation:
-(12x-18)
-12x+18+90=0
We add all the numbers together, and all the variables
-12x+108=0
We move all terms containing x to the left, all other terms to the right
-12x=-108
x=-108/-12
x=+9
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