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A+B+C=53
A+B    =33
    B+C=38



Răspuns :

53-33=20 c
53-38=15 a
20+15=35
53-35=18 b
15+18+20=53

53-33=20=>C B+20=38 B=18 A+18=33 A=15 15+18+20=53