1) х+5/12 - 9/20 = 11/15
х-1/30=11/15
х=11/15+1/30
х=23/30
2) х-11/30-16/45=2/9
х-13/18=2/9
х=2/9+13/18
х=17/18
3)х-7/15+5/8=17/24
х+19/120=17/24
х=17/24-19/120
х=11/20
4) 4/5 - х - 1/60 = 2/3
47/60 - х = 2/3
-х= 2/3 - 47/60
-х= -7/60
х= 7/60
5)19/4- (х - 21/8) = 23/6
19/4 - х + 21/8 = 23/6
59/8 - х = 23/6
-х = 23/6 - 59/8
-х= - 85/24
х= 85/24
6) 261/28 - (89/21 - х) = 44/7
261/28- 89/21+х = 44/7
61/12+х = 44/7
х = 44/7- 61/12
х=101/84