3n-9=90

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Solution for 3n-9=90 equation: 



3n-9=90

We move all terms to the left:

3n-9-(90)=0

We add all the numbers together, and all the variables

3n-99=0

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

3n=99

n=99/3

n=33

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