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12x=40+(4x)
We move all terms to the left:
12x-(40+(4x))=0
We add all the numbers together, and all the variables
12x-(4x+40)=0
We get rid of parentheses
12x-4x-40=0
We add all the numbers together, and all the variables
8x-40=0
We move all terms containing x to the left, all other terms to the right
8x=40
x=40/8
x=5
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