Which equation has exactly ONE solution?

A. 8+3x / 2 = 13 + X
B. 3+12X / 2 = 6X + 15
C. 10+15X / 5 = 3X + 10
D. 4X-20 / 4 = X - 5

D. 4X-20 / 4 = X - 5