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1/2x+1/4x+1/8x=21
4/8x+2/8x+1/8x=21
7/8x=21 /: 7/8
x=7
Ania wybrała liczbę 7
1/2x+1/4x+1/8x=21
4/8x+2/8x+1/8x=21
7/8x=21
x=24
Szukana liczba to 24.