2y-9=-y-12

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Solution for 2y-9=-y-12 equation: 



2y-9=-y-12

We move all terms to the left:

2y-9-(-y-12)=0

We add all the numbers together, and all the variables

2y-(-1y-12)-9=0

We get rid of parentheses

2y+1y+12-9=0

We add all the numbers together, and all the variables

3y+3=0

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

3y=-3

y=-3/3

y=-1

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