4y-9=y+12

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Solution for 4y-9=y+12 equation: 



4y-9=y+12

We move all terms to the left:

4y-9-(y+12)=0

We get rid of parentheses

4y-y-12-9=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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