12=y+15

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Solution for 12=y+15 equation: 



12=y+15

We move all terms to the left:

12-(y+15)=0

We get rid of parentheses

-y-15+12=0

We add all the numbers together, and all the variables

-1y-3=0

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

-y=3

y=3/-1

y=-3

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