-6y+21=12y-15

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Solution for -6y+21=12y-15 equation: 



-6y+21=12y-15

We move all terms to the left:

-6y+21-(12y-15)=0

We get rid of parentheses

-6y-12y+15+21=0

We add all the numbers together, and all the variables

-18y+36=0

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

-18y=-36

y=-36/-18

y=+2

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