(12х- 7*(х+4)/7=(26-4х)/7
(12х-7х-28)/7=(26-4х)/7
(5х-28)*7=(26-4х)*7
35х-196=182-28х
35х+28х=182+196
63х=378
х=378/63
х=6
(12х- 7*(х+4)/7=(26-4х)/7
(12х-7х-28)/7=(26-4х)/7
(5х-28)*7=(26-4х)*7
35х-196=182-28х
35х+28х=182+196
63х=378
х=378/63
х=6