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Ania + 4kg = Jurek-3kg
Ania = x-4
Jurek = x+3
x-4+x+3=70
2x=70-3+4
2x=71
x=35,5
Ania = x- 4 = 35,5 -4 =31,5
Jurek = x+3 = 35,5 +3 =38,5
38,5+31,5=70