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20x-10=8+10x+12
We move all terms to the left:
20x-10-(8+10x+12)=0
We add all the numbers together, and all the variables
20x-(10x+20)-10=0
We get rid of parentheses
20x-10x-20-10=0
We add all the numbers together, and all the variables
10x-30=0
We move all terms containing x to the left, all other terms to the right
10x=30
x=30/10
x=3
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