21-3y=3y-7

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Solution for 21-3y=3y-7 equation: 



21-3y=3y-7

We move all terms to the left:

21-3y-(3y-7)=0

We get rid of parentheses

-3y-3y+7+21=0

We add all the numbers together, and all the variables

-6y+28=0

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

-6y=-28

y=-28/-6

y=4+2/3

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