-21=u/9

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Solution for -21=u/9 equation: 



-21=u/9

We move all terms to the left:

-21-(u/9)=0

We add all the numbers together, and all the variables

-(+u/9)-21=0

We get rid of parentheses

-u/9-21=0

We multiply all the terms by the denominator


-u-21*9=0

We add all the numbers together, and all the variables

-1u-189=0

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

-u=189

u=189/-1

u=-189

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