3n+7n=99

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Solution for 3n+7n=99 equation: 



3n+7n=99

We move all terms to the left:

3n+7n-(99)=0

We add all the numbers together, and all the variables

10n-99=0

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

10n=99

n=99/10

n=9+9/10

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