-12=y+y+y

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Solution for -12=y+y+y equation: 



-12=y+y+y

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(+3y)-12=0

We get rid of parentheses

-3y-12=0

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

-3y=12

y=12/-3

y=-4

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