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(12x+4)-(3x=5)
We move all terms to the left:
(12x+4)-(3x-(5))=0
We get rid of parentheses
12x-3x+4+5=0
We add all the numbers together, and all the variables
9x+9=0
We move all terms containing x to the left, all other terms to the right
9x=-9
x=-9/9
x=-1
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