8002-c+2000=4000-1568

Răspuns :

8002-c+2000=4000-1568
8002-c+2000=2432
8002-c=2432-2000
8002-c=432
c=8002-432
c=7570

8002-c+2000 = 4000-1568 ;

c = 8002+2000-4000+1568 ;

c = 7570 ;