13y=21+6y

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Solution for 13y=21+6y equation: 



13y=21+6y

We move all terms to the left:

13y-(21+6y)=0

We add all the numbers together, and all the variables

13y-(6y+21)=0

We get rid of parentheses

13y-6y-21=0

We add all the numbers together, and all the variables

7y-21=0

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

7y=21

y=21/7

y=3

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