6y+9=3y+21

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Solution for 6y+9=3y+21 equation: 



6y+9=3y+21

We move all terms to the left:

6y+9-(3y+21)=0

We get rid of parentheses

6y-3y-21+9=0

We add all the numbers together, and all the variables

3y-12=0

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

3y=12

y=12/3

y=4

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