Which of the following equations have exactly one solution? Choose all answers that apply:
Choose all answers that apply:

(Choice A)
A
6x+15=6x+156x+15=6x+156, x, plus, 15, equals, 6, x, plus, 15

(Choice B)
B
6x-6=15x+156x−6=15x+156, x, minus, 6, equals, 15, x, plus, 15

(Choice C)
C
6x-6=6x+156x−6=6x+156, x, minus, 6, equals, 6, x, plus, 15

(Choice D)
D
6x-15=6x+156x−15=6x+156, x, minus, 15, equals, 6, x, plus, 15