Select all input values for which f(x)=6f(x)=6f, left parenthesis, x, right parenthesis, equals, 6. Choose all answers that apply: Choose all answers that apply: (Choice A) A x=-7x=−7x, equals, minus, 7 (Choice B) B x=-5x=−5x, equals, minus, 5 (Choice C) C x=2x=2x, equals, 2 (Choice D) D None of the above