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7x+21=8x-12
We move all terms to the left:
7x+21-(8x-12)=0
We get rid of parentheses
7x-8x+12+21=0
We add all the numbers together, and all the variables
-1x+33=0
We move all terms containing x to the left, all other terms to the right
-x=-33
x=-33/-1
x=+33
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