25
-------------------- = 4
2/3х + 0,25
4 * (2/3х + 0,25) = 25
8/3х + 1 = 25
8/3х = 25 - 1
8/3х = 24
х = 24 : 8/3
х = 24 : 8 * 3
х = 9
______________________________
36
------------- = 8
7 - 5/6х
8 * (7 - 5/6х) = 36
56 - 20/3х = 36
20/3х = 56 - 36
20/3х = 20
х = 20 : 20/3
х = 3
____________________________
27
------------------- = 4,5
5 1/3 + 1/9х
27
------------------- = 45/10
5 1/3 + 1/9х
27
------------------- = 9/2
16/3 + 1/9х
9 * (16/3 + 1/9х) = 27 * 2
48 + х = 54
х = 54 - 48
х = 6