9=15-7y

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Solution for 9=15-7y equation: 



9=15-7y

We move all terms to the left:

9-(15-7y)=0

We add all the numbers together, and all the variables

-(-7y+15)+9=0

We get rid of parentheses

7y-15+9=0

We add all the numbers together, and all the variables

7y-6=0

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

7y=6

y=6/7

y=6/7

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