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x + y = 3 2 x + 3 = 11 5x + y = 3 2 x + 3 = 7 7 x + 3 = 1 2 x + 4 = 12 2 x + y = 3 x + 4 = 21 2 x + 3 = 1 3 x 4 = 1 7 x 6 = 5 7 x 6 = 19​