3y-(2y+9)=12

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Solution for 3y-(2y+9)=12 equation: 



3y-(2y+9)=12

We move all terms to the left:

3y-(2y+9)-(12)=0

We get rid of parentheses

3y-2y-9-12=0

We add all the numbers together, and all the variables

y-21=0

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

y=21

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