21=2y-3

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Solution for 21=2y-3 equation: 



21=2y-3

We move all terms to the left:

21-(2y-3)=0

We get rid of parentheses

-2y+3+21=0

We add all the numbers together, and all the variables

-2y+24=0

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

-2y=-24

y=-24/-2

y=+12

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