E is the midpoint of DF=2x+4, and EF=3x-1. Find all segment lenghs?

E is the midpoint of DF. Then, DF = 2 EF
2x + 4 = 2 (3x - 1)
2x + 4 = 6x - 2
4x = 6
x = 3/2

Then,
DF = 2 * (3/2) + 4
DF = 7

DE = EF = 3 * (3/2) - 1
DE = EF = 7/2