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Mike took clothes to the cleaners three times last month. First, he brought 2 shirts and 1 pair of slacks and paid $7.47. The he brought 7 shirts, 2 pairs of slacks, and 1 sports coat and paid $26.90. Finally, he brought 4 shirts and 2 sports coats and paid $20.94. How much was he charged for each shirt, each pair of slacks and each sports coat?

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