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23+34+2x=x+12
We move all terms to the left:
23+34+2x-(x+12)=0
We add all the numbers together, and all the variables
2x-(x+12)+57=0
We get rid of parentheses
2x-x-12+57=0
We add all the numbers together, and all the variables
x+45=0
We move all terms containing x to the left, all other terms to the right
x=-45
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