Which of the following represents a valid first step to solving this system of equations using the substitution method? 2x - y = 7 ...... x = 2y - 1 A. 2x - y = 2y - 1 B. x = 2(2x - y) - 1 C. 2x - (2y - 1) = 7 D. 2(2y - 1)- y = 7

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