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ziemniaki - 5x
Kapusta -120+x
x+5x+x+120=1800
7x+120=1800
7x=1800-120
7x=1680
x=240 5x=240*5=1200 120+240=360
Odp:Buraków było 240kg, ziemniaków 1200kg ,a kapusty 360kg
5x - ilosc ziemniaków 5*240=1200
x+120 - ilosc kapusty 240+120=360
x+5x+x+120=1800
7x+120=1800
7x=1800-120
7x=1680/:7
x=240