2y=21-y

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Solution for 2y=21-y equation: 



2y=21-y

We move all terms to the left:

2y-(21-y)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

2y+1y-21=0

We add all the numbers together, and all the variables

3y-21=0

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

3y=21

y=21/3

y=7

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