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16 i 1/5 - pierwsza liczba
16 i 1/5 - 1 i 3/4 - druga liczba
x- trzecia liczba
Ś=(16⅕+(16⅕-1¾)+x)/3
37/3=(81/5+(81/5-7/4)+x)/3 |*3
37=81/5+(324/20-35/20)+x
37=81/5+289/20+x
37=324/20+289/20+x
37=613/20+x
740=613+20x
20x=127
x=127/20
x=6 i 7/20