A good answer might be:

This looks like another trap. Rather than blindly rushing in and calculate, try rearranging things:

( 4, -5, 6.2 ) + ( -43.132, 13.6, 86.5 ) - ( 4, -5, -4.8 ) =

( 4, -5, 6.2 ) + ( -43.132, 13.6, 86.5 ) + ( -4, 5,  4.8 ) =

( 4, -5, 6.2 ) + ( -4, 5, 4.8 ) + ( -43.132, 13.6, 86.5 )  =

( 0, 0, 11 )   + ( -43.132, 13.6, 86.5 ) = (-43.132, 13.6, 97.5 )

You would probably skip a few steps if you were doing this mentally.

d = ( -12.4,  14.8,   0.0 )T
e = (   6.2, -10.2,  17.0 )T
f = (   6.2,  -4.6, -17.0 )T