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con. jueves = 3/8 (x) queda x-3x/8 = (8x-3x)/8 = 5x/8
con. viernes = 4/9(5x/8) = 20x/72 queda = 5x/8-20x/72
(45x-20x)/72 = 25x /72
25x/72 = 1200
25x = 1200*72
x = 1200*72/25
x = 3456