9y+21=3y-15

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Solution for 9y+21=3y-15 equation: 



9y+21=3y-15

We move all terms to the left:

9y+21-(3y-15)=0

We get rid of parentheses

9y-3y+15+21=0

We add all the numbers together, and all the variables

6y+36=0

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

6y=-36

y=-36/6

y=-6

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