-9y=21-2y

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Solution for -9y=21-2y equation: 



-9y=21-2y

We move all terms to the left:

-9y-(21-2y)=0

We add all the numbers together, and all the variables

-9y-(-2y+21)=0

We get rid of parentheses

-9y+2y-21=0

We add all the numbers together, and all the variables

-7y-21=0

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

-7y=21

y=21/-7

y=-3

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