(2n+12)+(3n+18)=180

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Solution for (2n+12)+(3n+18)=180 equation: 



(2n+12)+(3n+18)=180

We move all terms to the left:

(2n+12)+(3n+18)-(180)=0

We get rid of parentheses

2n+3n+12+18-180=0

We add all the numbers together, and all the variables

5n-150=0

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

5n=150

n=150/5

n=30

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