12y+20=9y-1=15

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Solution for 12y+20=9y-1=15 equation: 



12y+20=9y-1=15

We move all terms to the left:

12y+20-(9y-1)=0

We get rid of parentheses

12y-9y+1+20=0

We add all the numbers together, and all the variables

3y+21=0

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

3y=-21

y=-21/3

y=-7

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