0,53•(-100):(-8,35+(-227)•(-0,05))= -53:(-8,35+11,35)= -53:3= -17цел.2/3
1 2/7 + 2 1/3 х + 3/14 + х =9
2 1/3 х + х =9-1 2/7 - 3/14
3 1/3 х =9-1 4/14 - 3/14
10/3х=9-1 7/14
10/3х=9-1 1/2
10/3х=7 1/2
10/3х=15/2
х=15/2:10/3=15/2*3/10=3/2*3/2=9/4=2 1/4
Х:19=26
х=26·19
х=494
408:х=17
х=408:17
х=24
(х+8):7=9
х+8=9·7
х+8=63
х=63-8
х=55