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x/4 + y/3 = 9 5x/6 - y/2 = 1
3x + 4y = 108 (a) 10x - 6y = 12 (b)
(a) x 3: 9x + 12y = 108
(b) x 2: 20x - 12y = 24 sumando estas dos ecuaciones se obtiene:
29x = 348, de donde x = 348/29 = 12
de (a): 3(12) + 4y = 108, luego y = (108 - 36)/4 = 18