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3x-13=5x-123
We move all terms to the left:
3x-13-(5x-123)=0
We get rid of parentheses
3x-5x+123-13=0
We add all the numbers together, and all the variables
-2x+110=0
We move all terms containing x to the left, all other terms to the right
-2x=-110
x=-110/-2
x=+55
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