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12x-36=4x+20
We move all terms to the left:
12x-36-(4x+20)=0
We get rid of parentheses
12x-4x-20-36=0
We add all the numbers together, and all the variables
8x-56=0
We move all terms containing x to the left, all other terms to the right
8x=56
x=56/8
x=7
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