4y-9=2y+21

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Solution for 4y-9=2y+21 equation: 



4y-9=2y+21

We move all terms to the left:

4y-9-(2y+21)=0

We get rid of parentheses

4y-2y-21-9=0

We add all the numbers together, and all the variables

2y-30=0

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

2y=30

y=30/2

y=15

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