12=21y-1

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Solution for 12=21y-1 equation: 



12=21y-1

We move all terms to the left:

12-(21y-1)=0

We get rid of parentheses

-21y+1+12=0

We add all the numbers together, and all the variables

-21y+13=0

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

-21y=-13

y=-13/-21

y=13/21

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