-21=u/3-6

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Solution for -21=u/3-6 equation: 



-21=u/3-6

We move all terms to the left:

-21-(u/3-6)=0

We get rid of parentheses

-u/3+6-21=0

We multiply all the terms by the denominator


-u+6*3-21*3=0

We add all the numbers together, and all the variables

-1u-45=0

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

-u=45

u=45/-1

u=-45

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