6=u-15

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Solution for 6=u-15 equation: 



6=u-15

We move all terms to the left:

6-(u-15)=0

We get rid of parentheses

-u+15+6=0

We add all the numbers together, and all the variables

-1u+21=0

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

-u=-21

u=-21/-1

u=+21

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