15=u+3

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Solution for 15=u+3 equation: 



15=u+3

We move all terms to the left:

15-(u+3)=0

We get rid of parentheses

-u-3+15=0

We add all the numbers together, and all the variables

-1u+12=0

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

-u=-12

u=-12/-1

u=+12

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