21+(-y)=2y

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Solution for 21+(-y)=2y equation: 



21+(-y)=2y

We move all terms to the left:

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

We add all the numbers together, and all the variables

(-1y)-2y+21=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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