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Identify the first step using the elimination method to solve the following system of equations: 6x - 4y = 24 5x + 10y = 30 A. 6x - 10y = 24 5x + 10y = 30 B. 30x - 20y = 120 -30x + 60y = 180 C. 60x - 40y = 24 20x + 40y = 30 D. 60x - 40y = 240 20x + 40y = 120
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