21=u/9+18

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Solution for 21=u/9+18 equation: 



21=u/9+18

We move all terms to the left:

21-(u/9+18)=0

We get rid of parentheses

-u/9-18+21=0

We multiply all the terms by the denominator


-u-18*9+21*9=0

We add all the numbers together, and all the variables

-1u+27=0

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

-u=-27

u=-27/-1

u=+27

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