21=14y-7y

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Solution for 21=14y-7y equation: 



21=14y-7y

We move all terms to the left:

21-(14y-7y)=0

We add all the numbers together, and all the variables

-(+7y)+21=0

We get rid of parentheses

-7y+21=0

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

-7y=-21

y=-21/-7

y=+3

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