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x+2 - ladownosc 2 samochodu
12-3=9
12x=9(x+2)
12x=9x+18
3x=18
x=6
x+2=8
12x = (x+2) * 9
12x = 9x + 18
3x = 18 \ :3
x = 6
Odp. Pierwszy samochód miał ładowność 6ton, drugi 8 ton.