Пошаговое объяснение:
1)
х/4 + х/3 = х/6 + 5; * 12
3x + 4x = 2x + 60
7x = 2x + 60
7x - 2x = 60
5x = 60
x = 60 : 5
x = 12
2)
2х/3 - 4х/5 = х/15 + 1; *15
10x - 12x = x + 15
-2x = x + 15
-2x - x = 15
-3x = 15
x = 15 : (-3)
x = -5
3)
3х/8 - х/6 = х/12 - 1; *24
9x - 4x = 2x - 24
5x = 2x - 24
5x - 2x = -24
3x = -24
x = -24 : 3
x = -8
