12=-y-3

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Solution for 12=-y-3 equation: 



12=-y-3

We move all terms to the left:

12-(-y-3)=0

We add all the numbers together, and all the variables

-(-1y-3)+12=0

We get rid of parentheses

1y+3+12=0

We add all the numbers together, and all the variables

y+15=0

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

y=-15

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