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6.3n-7.15+9.9=18.5
We move all terms to the left:
6.3n-7.15+9.9-(18.5)=0
We add all the numbers together, and all the variables
6.3n-15.75=0
We move all terms containing n to the left, all other terms to the right
6.3n=15.75
n=15.75/6.3
n=2+1/2
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