-2y=21-6y

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Solution for -2y=21-6y equation: 



-2y=21-6y

We move all terms to the left:

-2y-(21-6y)=0

We add all the numbers together, and all the variables

-2y-(-6y+21)=0

We get rid of parentheses

-2y+6y-21=0

We add all the numbers together, and all the variables

4y-21=0

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

4y=21

y=21/4

y=5+1/4

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