12n-13+13n+18=80

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Solution for 12n-13+13n+18=80 equation: 



12n-13+13n+18=80

We move all terms to the left:

12n-13+13n+18-(80)=0

We add all the numbers together, and all the variables

25n-75=0

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

25n=75

n=75/25

n=3

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