5y-7=y+21

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Solution for 5y-7=y+21 equation: 



5y-7=y+21

We move all terms to the left:

5y-7-(y+21)=0

We get rid of parentheses

5y-y-21-7=0

We add all the numbers together, and all the variables

4y-28=0

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

4y=28

y=28/4

y=7

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