Помогите решить дроби плииз

(1/2-4)*(5/12-5/3) = =(1/2-4)*(5/12-20/12) = = (1/2-4)*(-1 1/4) = -3 2/3 * (-1 1/4)= =-11/3*(-5/4) = 55/12 = = 4 7/12