3n+(8n+13)=90

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Solution for 3n+(8n+13)=90 equation: 



3n+(8n+13)=90

We move all terms to the left:

3n+(8n+13)-(90)=0

We get rid of parentheses

3n+8n+13-90=0

We add all the numbers together, and all the variables

11n-77=0

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

11n=77

n=77/11

n=7

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