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12x-12=20x+20
We move all terms to the left:
12x-12-(20x+20)=0
We get rid of parentheses
12x-20x-20-12=0
We add all the numbers together, and all the variables
-8x-32=0
We move all terms containing x to the left, all other terms to the right
-8x=32
x=32/-8
x=-4
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