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3x+21=4x-2
We move all terms to the left:
3x+21-(4x-2)=0
We get rid of parentheses
3x-4x+2+21=0
We add all the numbers together, and all the variables
-1x+23=0
We move all terms containing x to the left, all other terms to the right
-x=-23
x=-23/-1
x=+23
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