21=u/3-9

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Solution for 21=u/3-9 equation: 



21=u/3-9

We move all terms to the left:

21-(u/3-9)=0

We get rid of parentheses

-u/3+9+21=0

We multiply all the terms by the denominator


-u+9*3+21*3=0

We add all the numbers together, and all the variables

-1u+90=0

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

-u=-90

u=-90/-1

u=+90

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