n+n-18=90

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Solution for n+n-18=90 equation: 



n+n-18=90

We move all terms to the left:

n+n-18-(90)=0

We add all the numbers together, and all the variables

2n-108=0

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

2n=108

n=108/2

n=54

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