-21+15=-9y+6y

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Solution for -21+15=-9y+6y equation: 



-21+15=-9y+6y

We move all terms to the left:

-21+15-(-9y+6y)=0

We add all the numbers together, and all the variables

-(-3y)-21+15=0

We add all the numbers together, and all the variables

-(-3y)-6=0

We get rid of parentheses

3y-6=0

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

3y=6

y=6/3

y=2

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