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6 orzechów = ⅘reszty
reszta = ⅔x-3
6=⅘*(⅔x-3)
6=⁸/₁₅x-¹²/₅
6+¹²/₅=⁸/₁₅x
⁸/₁₅x=8⅖ |*¹⁵/₈
x=⁴²/₅ * ¹⁵/₈
x=15¾