jeśli do pewnej liczby odejmę jej 3/4 i jej 1/5 , to zostanie 4 . jaka to liczba?
x - (3/4) x - (1/5) x = 4 / * 20
20 x - 15 x - 4 x = 80
x = 80
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x - (3/4) x - (1/5) x = 4 / * 20
20 x - 15 x - 4 x = 80
x = 80
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