4u=u+15

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Solution for 4u=u+15 equation: 



4u=u+15

We move all terms to the left:

4u-(u+15)=0

We get rid of parentheses

4u-u-15=0

We add all the numbers together, and all the variables

3u-15=0

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

3u=15

u=15/3

u=5

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