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7x-wiek ojca teraz
x+5-wiek syna za 5 lat
7x+5- wiek ojca za 5 lat
(x+5)4=7x+5
4x+20=7x+5
4x-7x=5-20
-3x=-15/:(-3)
x=5
7x=7•5=35
Odp. Ojciec ma obecnie 35 lat, a syn 5 lat.