4y+9=7y+21

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Solution for 4y+9=7y+21 equation: 



4y+9=7y+21

We move all terms to the left:

4y+9-(7y+21)=0

We get rid of parentheses

4y-7y-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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