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3x-13=x+39
We move all terms to the left:
3x-13-(x+39)=0
We get rid of parentheses
3x-x-39-13=0
We add all the numbers together, and all the variables
2x-52=0
We move all terms containing x to the left, all other terms to the right
2x=52
x=52/2
x=26
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