So 4/5n-3/5=1/5n? To solve this you just have to bring over the n s to one side by bringing 4/5n over by subtracting it from both sides. 4/5n-3/5 becomes just -3/5 and 1/5n becomes -3/5n. And you get -3/5 = -3/5n. n will be 1 so that it keeps the equation equal.