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x=8%*(x+23) / 100%
100x=8%*(x+23)
100x=8x+184
92x=184
x=2kg
x=5*(x+21)/100%
100x=5x+105
95x=105kg
x=1,105kg
x=6(x+21)/100%
100x=6x+126
94x=126kg
x=1,340kg
1,340kg-1,105kg = 0,235kg