7n-15=5n+15=9

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Solution for 7n-15=5n+15=9 equation: 



7n-15=5n+15=9

We move all terms to the left:

7n-15-(5n+15)=0

We get rid of parentheses

7n-5n-15-15=0

We add all the numbers together, and all the variables

2n-30=0

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

2n=30

n=30/2

n=15

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