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
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