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12x-7=13(x-12)
We move all terms to the left:
12x-7-(13(x-12))=0
We calculate terms in parentheses: -(13(x-12)), so:We get rid of parentheses
13(x-12)
We multiply parentheses
13x-156
Back to the equation:
-(13x-156)
12x-13x+156-7=0
We add all the numbers together, and all the variables
-1x+149=0
We move all terms containing x to the left, all other terms to the right
-x=-149
x=-149/-1
x=+149
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