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20x-10=8x+20
We move all terms to the left:
20x-10-(8x+20)=0
We get rid of parentheses
20x-8x-20-10=0
We add all the numbers together, and all the variables
12x-30=0
We move all terms containing x to the left, all other terms to the right
12x=30
x=30/12
x=2+1/2
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