6y-9=-4y+21

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Solution for 6y-9=-4y+21 equation: 



6y-9=-4y+21

We move all terms to the left:

6y-9-(-4y+21)=0

We get rid of parentheses

6y+4y-21-9=0

We add all the numbers together, and all the variables

10y-30=0

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

10y=30

y=30/10

y=3

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