а*948-6390=429690,
а*948=429690+6390,
а=436080/948,
а=460;
273996/b+15764=16151,
273996/b=16151-15764,
b=273996/387,
b=708;
(50-x)/7+195=40*5,
(50-x)/7+195=200,
(50-x)/7=200-195,
50-x=5*7,
х=50-35,
х=15;
(270/у-2)*30=7*120,
(270/у-2)*30=840,
270/у-2=840/30,
270/у=28+2,
у=270/30,
у=9
