12y+15=6y+21

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



12y+15=6y+21

We move all terms to the left:

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

We get rid of parentheses

12y-6y-21+15=0

We add all the numbers together, and all the variables

6y-6=0

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

6y=6

y=6/6

y=1

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