2х/36=5/6
2х=5/6*36
2х=30
х=30/2
х=15
Проверка: 2*15/36=5/6 5/6=5/6
Ответ: х=15
4/9=3 х/54
3 х *9=4*54
27 х=216
х =8
7/21=3x/54
1/3=x/18
3x=18
x=6
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2х/36=5/6
2х=5/6*36
2х=30
х=30/2
х=15
Проверка: 2*15/36=5/6 5/6=5/6
Ответ: х=15
4/9=3 х/54
3 х *9=4*54
27 х=216
х =8
7/21=3x/54
1/3=x/18
3x=18
x=6