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y-masa rysia [kg]
{5x=2y
4x+12=2y |*(-1)
{5x=2y
-4x-12=-2y
x-12=0
x=12
5x=2y |:2
y=2,5x
y=2,5*12
y=30
{x=12
y=30
Odp.Ryś waży 30 kg.