3u-39=u+15

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Solution for 3u-39=u+15 equation: 



3u-39=u+15

We move all terms to the left:

3u-39-(u+15)=0

We get rid of parentheses

3u-u-15-39=0

We add all the numbers together, and all the variables

2u-54=0

We move all terms containing u to the left, all other terms to the right

2u=54

u=54/2

u=27

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