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7x-103=4x+266
We move all terms to the left:
7x-103-(4x+266)=0
We get rid of parentheses
7x-4x-266-103=0
We add all the numbers together, and all the variables
3x-369=0
We move all terms containing x to the left, all other terms to the right
3x=369
x=369/3
x=123
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