First, Let plain shirts be x Let fancy shirts be y x + y = 7 15x + 28y = 131 Multiply first equation by 28 to eliminate y: 28x + 28y = 196 15x + 28y = 131 Subtracting the two equations: 13x = 65 x = 5 Substituting x to get y: x + y = 7 5 + y = 7 y = 2 Answer: 5 plain shirts and 2 fancy shirts
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