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369+c-561+583-504=372

Răspuns :

369+c-561+583-504=372|+504 369+c-561+583=876|-583 369+c-561=293|+561 369+c=854|-369 C=485
369+c-561+583=372+504
369+c-561+583=876
369+c-561=876-583
369+c-561=293
369+c=293+561
369+c=854
c=854-369
c=485