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8x-21=24x-63
We move all terms to the left:
8x-21-(24x-63)=0
We get rid of parentheses
8x-24x+63-21=0
We add all the numbers together, and all the variables
-16x+42=0
We move all terms containing x to the left, all other terms to the right
-16x=-42
x=-42/-16
x=2+5/8
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