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4x+21=5x-43
We move all terms to the left:
4x+21-(5x-43)=0
We get rid of parentheses
4x-5x+43+21=0
We add all the numbers together, and all the variables
-1x+64=0
We move all terms containing x to the left, all other terms to the right
-x=-64
x=-64/-1
x=+64
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