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1/2m-masa 1. wałka
1/2m*2/3m -masa 2. wałka
3kg- masa 3 wałka
m-(1/2m+1/2*2/3m)-masa 3 wałka
porównujemy:
3=m-(1/2m+1/2*2/3m)
3=m-5/6m
3=1/6m
m=18kg