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x+y+z=120
y-x=z-y
z-x=4,5
x+y+z=120
y=(z+x)/2
z=4,5+x
x+(z+x)/2+4,5+x=120
y=(z+x)/2
z=4,5+x
x+(4,5+2x)/2+4,5+x=120
x+2,25+x+4,5+x=120
3x+6,75=120
3x=113,25
x=37,75
z=42,25
y=40
x+ x+ 4,5/2 +x+4,5=120
<=>3x+6,75=120
<=>3x=113,5
<=>x=37,75(kg)
janka 37,75+2,25= 40 (kg)
Paweł 37,75+4,5=42,25 (kg)