u-u+u-u+u=15

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



u-u+u-u+u=15

We move all terms to the left:

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

We add all the numbers together, and all the variables

u-15=0

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

u=15

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