=
72 : х = 8
8х = 72
х = 9
-------------------
=
11х = 88
х = 8
------------------
=
12 : х = 6
6х = 12
х = 2
-------------------
=
18х = 360
х = 20
-------------------
=
х : 56 = 2
х = 56*2
х = 112
-------------------
=
х : 20 = 5
х = 5 * 20
х = 100