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20x-8=12x+42
We move all terms to the left:
20x-8-(12x+42)=0
We get rid of parentheses
20x-12x-42-8=0
We add all the numbers together, and all the variables
8x-50=0
We move all terms containing x to the left, all other terms to the right
8x=50
x=50/8
x=6+1/4
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