15=-21+3y

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Solution for 15=-21+3y equation: 



15=-21+3y

We move all terms to the left:

15-(-21+3y)=0

We add all the numbers together, and all the variables

-(3y-21)+15=0

We get rid of parentheses

-3y+21+15=0

We add all the numbers together, and all the variables

-3y+36=0

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

-3y=-36

y=-36/-3

y=+12

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