-13=9+y

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Solution for -13=9+y equation: 



-13=9+y

We move all terms to the left:

-13-(9+y)=0

We add all the numbers together, and all the variables

-(y+9)-13=0

We get rid of parentheses

-y-9-13=0

We add all the numbers together, and all the variables

-1y-22=0

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

-y=22

y=22/-1

y=-22

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