Răspuns :

Ramona0904id
a+b+c=139
a=5c
b=a+7=5c+7
5c+5c+7+c=139
11c=132=>c=12;a=60;b=67
KittyKrissuid
a + b + c = 139
5c = a
a + 7 = b
5c + 7 = b
5c + 5c + 7 + c = 139
11c = 139 - 7
11c = 132
c = 132 : 11
c = 12
12 * 5 = a
60 = a
60 + 7 = 67 ( b )

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