3/4
Пошаговое объяснение:
(5/7)/((6/7)x + 3/7) - 1/2 = 1/6
(5/7)/((6/7)x + 3/7) = 1/6 + 1/2
(5/7)/((6/7)x + 3/7) = 1/6 + 3/6
(5/7)/((6/7)x + 3/7) = 4/6=2/3
(6/7)x + 3/7 = 5/7 : 2/3
(6/7)x + 3/7 = 15/14
(6/7)x = 15/14 - 3/7
(6/7)x = 9/14
x = 9/14 * 7/6
x = 3/4
