Raul used the steps shown below to solve the equation. In which step did Raul make a mistake?
5x-3 (2x+7) = 2x+9
Step 1: 5x-6x-21=2x+9
Step 2: - 11x-21=2x+9
Step 3: - 12x=30
Step 4: x=-30/12
A. Step 1
B. Step 2
C. Step 3
D. Step 4
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