13y-7=6y+21

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Solution for 13y-7=6y+21 equation: 



13y-7=6y+21

We move all terms to the left:

13y-7-(6y+21)=0

We get rid of parentheses

13y-6y-21-7=0

We add all the numbers together, and all the variables

7y-28=0

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

7y=28

y=28/7

y=4

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