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12x-12=4x+28=180
We move all terms to the left:
12x-12-(4x+28)=0
We get rid of parentheses
12x-4x-28-12=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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