Х : 4 = 10 + 28
х : 4 = 38
х = 38 * 4
х = 152
-------------------------
152 : 4 = 10 + 28
38 = 38
5 * х = 125 : 5
5 * х =25
х = 25 : 5
х = 5
---------------------
5 * 5 = 125 : 5
25 = 25
266 : х = 100 - 93
266 : х = 7
х = 266 : 7
х = 38
----------------------------
266 : 38 = 100 - 93
7 = 7
х - 28 = 4 * 10
х - 28 = 40
х = 40 + 28
х = 68
-----------------------
68 - 28 = 4 * 10
40 = 40
40 - х = 28
х = 40 - 28
х = 12
-------------------
40 - 12 = 28
28 = 28