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ms=cp*mr/100%
ms1=12*mr1/100
ms2=5*4/100=0,2kg
mr=mr1+4
ms=12*mr1/100+0,2=0,12mr1+0,2
0,1=(0,12*mr1+0,2)/(mr1+4) - mnożę na krzyż
0,1*mr1+0,4=0,12*mr1+0,2
0,02*mr1=0,2
mr1=10kg