A*948-6390=429690
a*948=429690+6390
a*948=436080
a=43080/948
a=460
_____________________________
460*948-6390=429690
429690=429690
273996/b+15764=16151
273996/b=16151-15764
273996/b=387
b=273996/387
b=708
---------------------------
273996/708+15764=16151
16151=16151
(50-x)/7+195=40*5
50-x/7+195=200
50-x/7=200-195
50-x/7=5
50-x=7*5
50-x=35
x=50-35
x=15
-------------------------------
(50-15)/7+195=200
200=200
(270/y-2)*30=7*120
(270/y-2)*30=840
270/y-2=840/30
270/y-2=28
270/y=28+2
270/y=30
y=270/30
y=9
---------------------------
(270/9-2)*30=840
840=840