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527-119-c=236 ,,,raspuns

Răspuns :

527-119-c=236
408-c=236
-c= 236-408
-c= -172

Iar daca il punem in modul
|-c = -172 | => c= 172
527-119-c=236
527-119=408
c=408-c=236
c=408-236
c=172
verificare:408-172=236