7y-21=4y-9

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



7y-21=4y-9

We move all terms to the left:

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

We get rid of parentheses

7y-4y+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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