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a+b+c=60
a+b =30
b+c=50


Răspuns :

A+b+c-b+c= 60-50
a=10
a+b=30
10+b=30
b=20
b+c=50
20+c=50
c=30
30+c=60 => c= 30
a+50=60 => a=10
10+b=30 => b=20