Ответ:
Пошаговое объяснение:
1/6
-------------- - 3/8 = 1/40
1/4х - 1/3
1/6 : (1/4х - 1/3) = 1/40 + 3/8
1/6 : (1/4х - 1/3) = 1/40 + 15/40
1/6 : (1/4х - 1/3) = 16/40
1/6 : (1/4х - 1/3) = 2/5
1/4х - 1/3 = 1/6 : 2/5
1/4х - 1/3 = 1/6 * 5/2
1/4х - 1/3 = 5/12
1/4х = 5/12 + 1/3
1/4х = 5/12 + 4/12
1/4х = 9/12
1/4х = 3/4
х = 3/4 : 1/4
х = 3/4 * 4/1
х = 3