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15x-98=12x-59
We move all terms to the left:
15x-98-(12x-59)=0
We get rid of parentheses
15x-12x+59-98=0
We add all the numbers together, and all the variables
3x-39=0
We move all terms containing x to the left, all other terms to the right
3x=39
x=39/3
x=13
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