12+3=12+y

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Solution for 12+3=12+y equation: 



12+3=12+y

We move all terms to the left:

12+3-(12+y)=0

We add all the numbers together, and all the variables

-(y+12)+12+3=0

We add all the numbers together, and all the variables

-(y+12)+15=0

We get rid of parentheses

-y-12+15=0

We add all the numbers together, and all the variables

-1y+3=0

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

-y=-3

y=-3/-1

y=+3

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