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7.8n-13=4
We move all terms to the left:
7.8n-13-(4)=0
We add all the numbers together, and all the variables
7.8n-17=0
We move all terms containing n to the left, all other terms to the right
7.8n=17
n=17/7.8
n=2+1/5.5714285714286
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