solve 3/10 n - 3 1/5 = -1 1/5 n=
3/10 n - 3 1/5 = -1 1/5 3/10 n = -1 1/5 + 3 1/5
3/10 n = 2.4n = 8
3/10 n - 3 1/5 = -1 1/5
3/10 n = -1 1/5 + 3 1/5
3/10 n = 2.4
n = 8