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7x-21=8x-24
We move all terms to the left:
7x-21-(8x-24)=0
We get rid of parentheses
7x-8x+24-21=0
We add all the numbers together, and all the variables
-1x+3=0
We move all terms containing x to the left, all other terms to the right
-x=-3
x=-3/-1
x=+3
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