5)-4 2/7-(1 1/3-2 2/5)*(-5/8)=-4 2/7+(1 5/15-2 6/15)*5/8=-4 2/7+(-1 1/15)*5/8=
=-4 2/7-1 1/15*5/8=-4 2/7-16/15*5/8=-4 2/7-2/3*1/1=-4 2/7-2/3=
=-4 6/21-14/21=-4 20/21
6)(-2 3/7-1 5/21)*3 2/11+10 1/3=(-2 9/21-1 5/21)*35/11+10 1/3=
=(-3 14/21)*35/11+10 1/3=(-3 2/3)*35/11+10 1/3=-11/3*35/11+10 1/3=
=-1/3*35/1+10 1/3=-35/3+10 1/3=-11 2/3+10 1/3=-1 1/3