n+(12n-3)+(7n+4)=301

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Solution for n+(12n-3)+(7n+4)=301 equation: 



n+(12n-3)+(7n+4)=301

We move all terms to the left:

n+(12n-3)+(7n+4)-(301)=0

We get rid of parentheses

n+12n+7n-3+4-301=0

We add all the numbers together, and all the variables

20n-300=0

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

20n=300

n=300/20

n=15

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