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21x-18=8x+10
We move all terms to the left:
21x-18-(8x+10)=0
We get rid of parentheses
21x-8x-10-18=0
We add all the numbers together, and all the variables
13x-28=0
We move all terms containing x to the left, all other terms to the right
13x=28
x=28/13
x=2+2/13
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