-21-15y=231+6y

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Solution for -21-15y=231+6y equation: 



-21-15y=231+6y

We move all terms to the left:

-21-15y-(231+6y)=0

We add all the numbers together, and all the variables

-15y-(6y+231)-21=0

We get rid of parentheses

-15y-6y-231-21=0

We add all the numbers together, and all the variables

-21y-252=0

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

-21y=252

y=252/-21

y=-12

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