OG详解-OG5 数学1 Q11

Choice C is correct. Dividing all terms in the given equation by 4 yields 4x4​−284​=−244​​ , or x-7 = -6. Therefore, the value of x-7 is -6.
Choice A is incorrect. This is the value of 4x-28, not x-7. Choice B is incorrect and may result from conceptual or calculation errors. Choice D is incorrect and may result from conceptual or calculation errors.