3y-7=5y+21.

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Solution for 3y-7=5y+21. equation: 



3y-7=5y+21.

We move all terms to the left:

3y-7-(5y+21.)=0

We add all the numbers together, and all the variables

3y-(5y+21)-7=0

We get rid of parentheses

3y-5y-21-7=0

We add all the numbers together, and all the variables

-2y-28=0

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

-2y=28

y=28/-2

y=-14

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