7y-7=4y+21

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



7y-7=4y+21

We move all terms to the left:

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

We get rid of parentheses

7y-4y-21-7=0

We add all the numbers together, and all the variables

3y-28=0

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

3y=28

y=28/3

y=9+1/3

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