Реши уравнения: х*3+435=1.350 у+1.806: 6=4.000 с-1.020=1.520: 4 !

х*3=1350-435             4000-у=1806:6                        с-1020=380

х*3=915                        4000-у=301                              с=1020+380

х=915:3                         у=4000-301                             с=...   

х=...                                 у=...

(1.350-435-3):3 

4000-1806:6

1520:4-1020