12+y=9-y

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Solution for 12+y=9-y equation: 



12+y=9-y

We move all terms to the left:

12+y-(9-y)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

y+1y-9+12=0

We add all the numbers together, and all the variables

2y+3=0

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

2y=-3

y=-3/2

y=-1+1/2

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