21=12+y

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Solution for 21=12+y equation: 



21=12+y

We move all terms to the left:

21-(12+y)=0

We add all the numbers together, and all the variables

-(y+12)+21=0

We get rid of parentheses

-y-12+21=0

We add all the numbers together, and all the variables

-1y+9=0

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

-y=-9

y=-9/-1

y=+9

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