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21=8x-43
We move all terms to the left:
21-(8x-43)=0
We get rid of parentheses
-8x+43+21=0
We add all the numbers together, and all the variables
-8x+64=0
We move all terms containing x to the left, all other terms to the right
-8x=-64
x=-64/-8
x=+8
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