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2. y-x=80
3. y/x=4
y=4x
podstawiam do 2 : 4x-x=80
3x=80
x=80/3
a więc y=4x=4*80/3=320/3
podstawiam do 1. :
1/f=3/80+3/320 /*320
320/f=12+3
320/f=15 / *f
320=15f / 15
f=320/15=21 i 5/15 = 21 1/3.