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37,4 kg × 15% = 5,61
37,4 + 5,61 = 43,01
43,01kg × 10% = 4,3
43,01-4,3= 38,71 kg
x=waga przed
x+0,1x-0.15*(x+0.1x)=37,4
1,1x-0,165x=37,4
0,935x=37,4
x=40