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3x-21=4x+6
We move all terms to the left:
3x-21-(4x+6)=0
We get rid of parentheses
3x-4x-6-21=0
We add all the numbers together, and all the variables
-1x-27=0
We move all terms containing x to the left, all other terms to the right
-x=27
x=27/-1
x=-27
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