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39x-39=30x+60
We move all terms to the left:
39x-39-(30x+60)=0
We get rid of parentheses
39x-30x-60-39=0
We add all the numbers together, and all the variables
9x-99=0
We move all terms containing x to the left, all other terms to the right
9x=99
x=99/9
x=11
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