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5x - Piotrka
x+5x=42
6x=42/:6
x=7
5*7=35
Pies waży 7kg, a Piotrek 35 =)
⅕x - waga psa
x + ⅕x = 42
1⅕ x = 42
x = 35
piotrek - 35
pies - ⅕ * 35 = 7