3/4+2/3=9/12+8/12=17/12=1 5/12
11/12-5/6=11/12-10/12=1/12
1-5/8=3/8
5/48+3/8+1/48=6/48+3/8=
=1/8+3/8=4/8=1/2
(7/15+2/9)-2/15=7/15-2/15+2/9=
=5/15+2/9=1/3+2/9=3/9+2/9=5/9
14/27-(5/27+1/6)=
=14/27-5/27-1/6=9/27-1/6=
=1/3-1/6=2/6-1/6=1/6
(20-19 3/4)+(17 3/4-17)+
+(2 1/2-17/24)=
=1/4+3/4+(5/2-17/24)=
=1+(60/24-17/24)=1+43/24=
=1+1 19/24=2 19/24
х+14 2/3=26 4/7
х=26 4/7-14 2/3
х=186/7-44/3
х=558/21-308/21
х=250/21=11 19/21