12n+8n=400

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Solution for 12n+8n=400 equation: 



12n+8n=400

We move all terms to the left:

12n+8n-(400)=0

We add all the numbers together, and all the variables

20n-400=0

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

20n=400

n=400/20

n=20

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