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y-II liczba
x+y=48 /-y
0,25x+0,75y=26
x=48-y
0,25*(48-y)+0,75y=26
x=48-y
12-0,25y+0,75y=26
x=48-y
12+0,5y=26 /-12
x=48-y
0,5y=14 /*2
x=48-y
y=28
x=48-28
y=28
x=20
y=28
Spr.
20+28=48
0,25*20+0,75*28=20+28=48
Te liczby to 20 i 28 ;))