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7.5n=13.5
We move all terms to the left:
7.5n-(13.5)=0
We add all the numbers together, and all the variables
7.5n-13.5=0
We move all terms containing n to the left, all other terms to the right
7.5n=13.5
n=13.5/7.5
n=1+6/7.5
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