21=y-12

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Solution for 21=y-12 equation: 



21=y-12

We move all terms to the left:

21-(y-12)=0

We get rid of parentheses

-y+12+21=0

We add all the numbers together, and all the variables

-1y+33=0

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

-y=-33

y=-33/-1

y=+33

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