(3n+20)+(6n-25)=180

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Solution for (3n+20)+(6n-25)=180 equation: 



(3n+20)+(6n-25)=180

We move all terms to the left:

(3n+20)+(6n-25)-(180)=0

We get rid of parentheses

3n+6n+20-25-180=0

We add all the numbers together, and all the variables

9n-185=0

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

9n=185

n=185/9

n=20+5/9

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