2n+n+18=90

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Solution for 2n+n+18=90 equation: 



2n+n+18=90

We move all terms to the left:

2n+n+18-(90)=0

We add all the numbers together, and all the variables

3n-72=0

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

3n=72

n=72/3

n=24

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