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20x-8=21x+35
We move all terms to the left:
20x-8-(21x+35)=0
We get rid of parentheses
20x-21x-35-8=0
We add all the numbers together, and all the variables
-1x-43=0
We move all terms containing x to the left, all other terms to the right
-x=43
x=43/-1
x=-43
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