1)
x - 1/4 = 3/7
x = 3/7 + 1/4
x = 12/28 + 7/28
x = 19/28
2)
1/2 - x = 3/8
-x = 3/8 - 1/2
-x = 3/8 - 4/8
-x = -1/8
x = 1/8
3)
y + 4/15 = 5/12
y = 5/12 - 4/15
y = 25/60 - 16/60
y = 9/60
y = 3/20
Пошаговое объяснение:
