Question 17792
 -(3/5)[2/3-1/2(3/4-1/2)]
=-(3/5)[2/3-1/2(3/4-2/4)]
=-(3/5)[2/3-1/2(1/4)]
=-(3/5)[2/3-1/8]
=-(3/5)[16/24-3/24]
=-(3/5)[13/24]
=-39/120 = -13/40