15:5 3x [- 0.75] x [- 3:9 5x [- 13:5] =?

15:5 3x [- 0.75] x [- 3:9 5x [- 13:5] =?

15:5 3x [- 0.75] x [- 3:9 5x [- 13:5]
=78/5*3/4*(-32/5)*(-5/13)
=78/5*3/4*32/13
=192/5*3/4
=144/5
=28 and 4 / 5