3. Select all equations that have exactly one solution.
A 5x + 8 = 5x - 15
B. 3x +4= 7x-1
c. 3 (x - 12) = 4x - 36
D. 2 (x-1) + x = 2x - 7
E. 4 (2x - 5) - 3x = 5x-20