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6(2x+1)=(-138)
We move all terms to the left:
6(2x+1)-((-138))=0
We add all the numbers together, and all the variables
6(2x+1)+138=0
We multiply parentheses
12x+6+138=0
We add all the numbers together, and all the variables
12x+144=0
We move all terms containing x to the left, all other terms to the right
12x=-144
x=-144/12
x=-12
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