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2x-123=12x+217
We move all terms to the left:
2x-123-(12x+217)=0
We get rid of parentheses
2x-12x-217-123=0
We add all the numbers together, and all the variables
-10x-340=0
We move all terms containing x to the left, all other terms to the right
-10x=340
x=340/-10
x=-34
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