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12x-36=8x+12=180
We move all terms to the left:
12x-36-(8x+12)=0
We get rid of parentheses
12x-8x-12-36=0
We add all the numbers together, and all the variables
4x-48=0
We move all terms containing x to the left, all other terms to the right
4x=48
x=48/4
x=12
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