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4x - waga ojca
4x-20 - waga matki
x + 4x + 4x - 20 = 178
9x = 178 + 20
9x = 198
x = 22
4 * 22 = 88 - ojciec
88 - 20 = 68 - matka
odp: Ojciec waży 88 kg, matka 68 kg , a syn 22 kg.