40-50:X=38
36•X=24•3

Задание 1.
40-50/х=38
-50/х = 38-40
-50/х = -2 | :(-50)
х = 2/50 = 1/25 = 0,04

Задание 2.
36*х = 24*3 | :3
12*х = 24 | :12
х = 24/12 =2