Ethan, just like dealing with fractions, we have to find and apply a common denominator. Once we apply it, we only use the numerators.
The common denominator is 6n. 2/3n = 4/6n, right? Applying it through the entire equation and leaving the numerator off, we have...
4 - 5n = 1 + 2n
7n = 3
n = 3/7
