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