5y-9+y+21=5y+20-3y

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Solution for 5y-9+y+21=5y+20-3y equation: 



5y-9+y+21=5y+20-3y

We move all terms to the left:

5y-9+y+21-(5y+20-3y)=0

We add all the numbers together, and all the variables

5y+y-(2y+20)-9+21=0

We add all the numbers together, and all the variables

6y-(2y+20)+12=0

We get rid of parentheses

6y-2y-20+12=0

We add all the numbers together, and all the variables

4y-8=0

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

4y=8

y=8/4

y=2

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