15=u/3-12

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Solution for 15=u/3-12 equation: 



15=u/3-12

We move all terms to the left:

15-(u/3-12)=0

We get rid of parentheses

-u/3+12+15=0

We multiply all the terms by the denominator


-u+12*3+15*3=0

We add all the numbers together, and all the variables

-1u+81=0

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

-u=-81

u=-81/-1

u=+81

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