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3.8n-1.4n=18
We move all terms to the left:
3.8n-1.4n-(18)=0
We add all the numbers together, and all the variables
2.4n-18=0
We move all terms containing n to the left, all other terms to the right
2.4n=18
n=18/2.4
n=7+1/2
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