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20x-137=12x-89
We move all terms to the left:
20x-137-(12x-89)=0
We get rid of parentheses
20x-12x+89-137=0
We add all the numbers together, and all the variables
8x-48=0
We move all terms containing x to the left, all other terms to the right
8x=48
x=48/8
x=6
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