6=21-3y

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Solution for 6=21-3y equation: 



6=21-3y

We move all terms to the left:

6-(21-3y)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3y-21+6=0

We add all the numbers together, and all the variables

3y-15=0

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

3y=15

y=15/3

y=5

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