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20x4 = 80 kg
Basia waży 60 a Darek 80
x + 20 kg=waga Darka
x=¾(x+20)
x=¾x+ 15
x-¾x=15
¼x=15/razy 4
x=60 kg
Basia waży 60 kg
Darek waży 60+20=80kg