-12=-y-21

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Solution for -12=-y-21 equation: 



-12=-y-21

We move all terms to the left:

-12-(-y-21)=0

We add all the numbers together, and all the variables

-(-1y-21)-12=0

We get rid of parentheses

1y+21-12=0

We add all the numbers together, and all the variables

y+9=0

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

y=-9

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