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6+12(x+13)=
We move all terms to the left:
6+12(x+13)-()=0
We add all the numbers together, and all the variables
12(x+13)=0
We multiply parentheses
12x+156=0
We move all terms containing x to the left, all other terms to the right
12x=-156
x=-156/12
x=-13
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