(5х+2х)*14=294 (12у-5у):4=21 (19х+6х):35=5 234:(21y-8y)=3

(5х+2х)*14=2947х=294/14
7х=21
х=21/7
х=3
<span>(12у-5у):4=21
7у=21*4
7у=84
у=84/7
у=12
(19х+6х):35=5
25х=5*35
25х=175
х=175/25
х=7
234:(21y-8y)=3</span>
13у=234/3
13у=78
у=78/13
у=6