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x-3 - waga Anny
x-3-0,15(x-3)=x-15
x-3-0,15x+0,45=x-15
-0,15x=-15+3-0,45
0,15x=12,45
x=83
odp: waga Zofii 83 kg.
x-3
83-3=80
odp: waga Anny 80 kg.
x-3= wga Anny
x-3-15%(x-3)=x-15
x-3-0,15(x-3)=x-15
x-3-0,15x-0,45=x-15
x-0,15x-x=-15+3+0,45
-0,15x=-12,45/*-0,15
x=83
83-3=80
zofia ważyła 83 kg, a Anna 80 kg