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1/3x+1/6x+150 = x
2/6x+1/6x-x= -150
3/6x-x=-150
-3/6x = -150
-1/2x = -150 / *(-2)
x = 300 m
1/6 * 300 = 50 m
Odp: Rzeka ma szerokosc 50m.