4y-21=7y-9

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



4y-21=7y-9

We move all terms to the left:

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

We get rid of parentheses

4y-7y+9-21=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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