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12x+2=34x+21
We move all terms to the left:
12x+2-(34x+21)=0
We get rid of parentheses
12x-34x-21+2=0
We add all the numbers together, and all the variables
-22x-19=0
We move all terms containing x to the left, all other terms to the right
-22x=19
x=19/-22
x=-19/22
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