a)х-7/15=17/24-15/24 x-7/15=2/24 x-7/15=1/12 x-28/60=5/60 x=28/60+5/60 x=33/60 x=11/20 б)4/5-(x+1/70)=4/7 28/35-(x+1/70)=20/35 x+1/70=8/35 x=8/35-1/70 x=16/70-1/70 x=15/70 x=3/14 в)4 3/4-(x-2 5/8)=3 5/6 4 9/12-(x-2 5/8)=3 10/12 x-2 5/8=4 9/12-3 10/12 x-2 5/8=3 21/12-3 10/12 x-2 5/8=11/12 x-2 15/24=22/24 x=2 15/24+22/24 x=2 37/24 x=3 13/24 г)9 9/28-(4 5/21-x)=6 2/7 9 9/28-(4 5/21-x)=6 8/28 4 5/21-x=9 9/28-6 8/28 4 5/21-x=9 9/28-6 8/28 4 5/21-x=3 1/28 x=4 20/84-3 3/84 x=1 17/84