7х *14 = 294
98х = 294
х =294 : 98
х = 3
---------------------------
7у : 4 = 21
7у = 21 * 4
7х = 84
х = 12
----------------------------
25х : 35 = 5
25х = 5 * 35
25х = 175
х = 7
--------------------------
234 : 13у = 3
13у = 234 : 3
13у = 78
у = 6
--------------------------