21-y=2y+3

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Solution for 21-y=2y+3 equation: 



21-y=2y+3

We move all terms to the left:

21-y-(2y+3)=0

We add all the numbers together, and all the variables

-1y-(2y+3)+21=0

We get rid of parentheses

-1y-2y-3+21=0

We add all the numbers together, and all the variables

-3y+18=0

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

-3y=-18

y=-18/-3

y=+6

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