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12x-20=4x-4
We move all terms to the left:
12x-20-(4x-4)=0
We get rid of parentheses
12x-4x+4-20=0
We add all the numbers together, and all the variables
8x-16=0
We move all terms containing x to the left, all other terms to the right
8x=16
x=16/8
x=2
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