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12x-12=4x-20
We move all terms to the left:
12x-12-(4x-20)=0
We get rid of parentheses
12x-4x+20-12=0
We add all the numbers together, and all the variables
8x+8=0
We move all terms containing x to the left, all other terms to the right
8x=-8
x=-8/8
x=-1
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