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150+1/3x+1/6x = x
x-(1/3x+1/6x) = 150
x - (2/6x+1/6x) = 150
x - 3/6x = 150
3/6x = 150
1/2x = 150 / *2
x = 300m
1/6x = 300:6 = 50 m
odp rzeka ma szerokosc 50m