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12 - x
9 - x + 2
są to wielkości odwrotni proporcjonalne więc zamieniamy
12- x+2
9 - x
12x = 9 (x+2)
12x = 9x + 18 I - 9x
3x = 18 I :3
x =6 - ladownosc malego samochodu
6 + 2 = 8 - ladownosc duzego samochodu =D