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123=2x-13
We move all terms to the left:
123-(2x-13)=0
We get rid of parentheses
-2x+13+123=0
We add all the numbers together, and all the variables
-2x+136=0
We move all terms containing x to the left, all other terms to the right
-2x=-136
x=-136/-2
x=+68
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