-9y+5y=5-8y-21

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Solution for -9y+5y=5-8y-21 equation: 



-9y+5y=5-8y-21

We move all terms to the left:

-9y+5y-(5-8y-21)=0

We add all the numbers together, and all the variables

-9y+5y-(-8y-16)=0

We add all the numbers together, and all the variables

-4y-(-8y-16)=0

We get rid of parentheses

-4y+8y+16=0

We add all the numbers together, and all the variables

4y+16=0

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

4y=-16

y=-16/4

y=-4

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