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bcalle
The easiest way to isolate the variable is to multiply by the reciprocal. This leaves n on the left and 12*(5/3) on the right.
The answer is 20
AlbertsStuff
Since 3/5n=12

We're searching for the variable n

So your solution would be

3n = 12 x 5 

3n = 60

Now divide 60 by 3n

We would now have 

n = 20

Hopefully this helped. :)