różnica dwóch liczb wynosi 20.odjemnik to 30 ile wynosi odjemna?
x - 30 = 20
x = 20 + 30
x = 50
sprawdzenie
50 - 30 = 20
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x - 30 = 20
x = 20 + 30
x = 50
sprawdzenie
50 - 30 = 20