(3n-15)+(2n+5)=80

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Solution for (3n-15)+(2n+5)=80 equation: 



(3n-15)+(2n+5)=80

We move all terms to the left:

(3n-15)+(2n+5)-(80)=0

We get rid of parentheses

3n+2n-15+5-80=0

We add all the numbers together, and all the variables

5n-90=0

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

5n=90

n=90/5

n=18

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