4 1/6 (1/4 х+14/15) - 1 5/6=2/3,
25/6 (1/4 х+14/15) - 11/6=2/3,
25/6*1/4 х+25/6*14/15-11/6=2/3,
25/24 х+35/9-11/6=2/3,
25/24 х=11/6-35/9+2/3,
25/24 х=75/54,
х=75/54:25/24,
х=75/54*24/25,
х=4/3,
х=1 1/3
ответ: 1 1/3
4 1/6 (1/4 х+14/15) - 1 5/6=2/3,
25/6 (1/4 х+14/15) - 11/6=2/3,
25/6*1/4 х+25/6*14/15-11/6=2/3,
25/24 х+35/9-11/6=2/3,
25/24 х=11/6-35/9+2/3,
25/24 х=75/54,
х=75/54:25/24,
х=75/54*24/25,
х=4/3,
х=1 1/3
ответ: 1 1/3