(19 - 13 2/3) : (-7 1/9)

1. Convert mixed numbers to improper fractions: (19 - 41/3) : (-64/9).
2. Perform subtraction: ((57-41)/3) : (-64/9) = (16/3) : (-64/9).
3. Divide the fractions: (16/3) * (-9/64) = (16*(-9))/(3*64) = (1*(-3))/(1*4) = -3/4 = -0.75.