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Advanced Math / Nonlinear equations in one variable and systems of equations in two variables Difficulty: Medium

If 42 x = 7 x , what is the value of 7 x 2 ?

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Explanation

Choice C is correct. Multiplying both sides of the given equation by x yields 42=7x2. Therefore, the value of 7x2 is 42.

Choice A is incorrect and may result from conceptual or calculation errors.

Choice B is incorrect and may result from conceptual or calculation errors.

Choice D is incorrect and may result from conceptual or calculation errors.