-y+9=8y-6y+21

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Solution for -y+9=8y-6y+21 equation: 



-y+9=8y-6y+21

We move all terms to the left:

-y+9-(8y-6y+21)=0

We add all the numbers together, and all the variables

-y-(2y+21)+9=0

We add all the numbers together, and all the variables

-1y-(2y+21)+9=0

We get rid of parentheses

-1y-2y-21+9=0

We add all the numbers together, and all the variables

-3y-12=0

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

-3y=12

y=12/-3

y=-4

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