Răspuns :
c=27
a-b=54⇒a=b+54
87a-87b-54c
(b+54)·87-87b-(54·27)
87b+87·54-87b-54·27
87·54-54·27
54(87-27)
54*60=3240
a-b=54⇒a=b+54
87a-87b-54c
(b+54)·87-87b-(54·27)
87b+87·54-87b-54·27
87·54-54·27
54(87-27)
54*60=3240