3n+9=99

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Solution for 3n+9=99 equation: 



3n+9=99

We move all terms to the left:

3n+9-(99)=0

We add all the numbers together, and all the variables

3n-90=0

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

3n=90

n=90/3

n=30

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