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2u-39*2=u+15
We move all terms to the left:
2u-39*2-(u+15)=0
We add all the numbers together, and all the variables
2u-(u+15)-78=0
We get rid of parentheses
2u-u-15-78=0
We add all the numbers together, and all the variables
u-93=0
We move all terms containing u to the left, all other terms to the right
u=93
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