Ответ:

а) 325 : x = 15

x = 325 • 15

x = 4875

b) 10x = 32 + 38

10x = 70

x = 70 : 10

x = 7

c) 124 : x = 12 - 8

124 : x = 4

x = 124 • 4

x = 496