(5х+2х)*14=294
(12y-5y):4=21
(19х+6х):35=5
234:(21y-8y)=3
7x*14=294
7x=294:14
7x=21
x=21:7
x=3
7y:4=21
7y=21*4
7y=84
y=84:7
y=12
25x:35=5
25x=5*35
25x=175
x=175:25
x=7
234:13y=3