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¾*⁸/₇=
²⁴/₂₈=/:4
⁶/₇
odp.⁶/₇
x-szukana liczba
⅚x=12½/:⁵/₆
x=²⁵/₂ * ⁶/₅
x=⁵/₁ * ³/₁
x=¹⁵/₁
x=15
odp.szukana liczba to 15
3/4*8/7= 6/7
5/6x=25/2*1
x= 15