Simplificando xfaaaaaa

Explicación paso a paso:
3/4:[-7/3.{4/6.-3/2:7/3}]=
3/4:[-7/3.{-12/12:7/3}]=
3/4:[-7/3.{-36/84}]=
3/4:[-7/3.{-3/7}]=
3/4:[21/21]=
3/4:1=3/4