21=-3-6y

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Solution for 21=-3-6y equation: 



21=-3-6y

We move all terms to the left:

21-(-3-6y)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

6y+3+21=0

We add all the numbers together, and all the variables

6y+24=0

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

6y=-24

y=-24/6

y=-4

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