21=-6-3y

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Solution for 21=-6-3y equation: 



21=-6-3y

We move all terms to the left:

21-(-6-3y)=0

We add all the numbers together, and all the variables

-(-3y-6)+21=0

We get rid of parentheses

3y+6+21=0

We add all the numbers together, and all the variables

3y+27=0

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

3y=-27

y=-27/3

y=-9

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