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3a i 3b - 139kg
3b i 3c - 118kg
183kg - 139kg = 44kg - 3c
118kg - 44kg = 74kg - 3b
139kg - 74kg = 65kg - 3a
a+b=139
b+c=118
c=183-(a+b)
c=183-139
c=44
b+c=118
b=118-c
b=118-44
b=74
a+b=139
a=139-b
a=139-74
a=65