12 3/17 + x + 8 16\17=23 2\17
12 3/17+х +8 16/17 =23 2/17 (12+8)+(3/17+16/17)=20+19/17=21 2/17
х+21 2/17 = 23 2/17
х= 23 2/17 - 21 2/17
х=2
12 3/17+х+ 8 16/17=23 2/17 12 3/17+8 16/17=(12+8)+(3/17+16/17)=20+19/17=
20+1 2/17=21 целая 2/17
21 2/17+х= 23 2/17
х=23 2/17- 21 2/17