7-7n+3n=15

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Solution for 7-7n+3n=15 equation: 



7-7n+3n=15

We move all terms to the left:

7-7n+3n-(15)=0

We add all the numbers together, and all the variables

-4n-8=0

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

-4n=8

n=8/-4

n=-2

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