4y+9=3y-12

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Solution for 4y+9=3y-12 equation: 



4y+9=3y-12

We move all terms to the left:

4y+9-(3y-12)=0

We get rid of parentheses

4y-3y+12+9=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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