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5x+(7x+6)=138
We move all terms to the left:
5x+(7x+6)-(138)=0
We get rid of parentheses
5x+7x+6-138=0
We add all the numbers together, and all the variables
12x-132=0
We move all terms containing x to the left, all other terms to the right
12x=132
x=132/12
x=11
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