OG详解-OG9 数学2 Q1

Choice B is correct. Subtracting 7 from each side of the given equation yields w = 350. Therefore, the value of w that is the solution to the given equation is  350.
Choice A is incorrect. This is the value of w that is the solution to the equation 7w = 357, not w+7 = 357. Choice C is incorrect. This is the value of w that is the solution to the equation w-7 = 357, not w+7 = 357. Choice D is incorrect and may result from conceptual or calculation errors.