[tex]\text{Varianta I:}\\\\-1,(7) = -1\dfrac{7}{9} = -\dfrac{1\cdot 9+7}{9} = -\dfrac{16}{9}\\ \\\\\text{Varianta II:}\\\\-1,(7) = -\dfrac{17-1}{9} = -\dfrac{16}{9}[/tex]
