57=12y+21

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Solution for 57=12y+21 equation: 



57=12y+21

We move all terms to the left:

57-(12y+21)=0

We get rid of parentheses

-12y-21+57=0

We add all the numbers together, and all the variables

-12y+36=0

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

-12y=-36

y=-36/-12

y=+3

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