21=y/3-9

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Solution for 21=y/3-9 equation: 



21=y/3-9

We move all terms to the left:

21-(y/3-9)=0

We get rid of parentheses

-y/3+9+21=0

We multiply all the terms by the denominator


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

We add all the numbers together, and all the variables

-1y+90=0

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

-y=-90

y=-90/-1

y=+90

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