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denominador = 3x-1
(x+8)/(3x-1+4) = 11/12
12(x+8) = 11(3x+3)
12x + 96 = 33x + 33
12x -33x = 33 - 96
-21x = -63
x = -63/-21
x = 3
numerador = x = 3
denominador = 3x-1 = 3*3 -1 = 9-1 = 8
el numero es 3/8