\(=-\dfrac{7}{19}\left(\dfrac{8}{11}+\dfrac{3}{11}\right)-\dfrac{12}{19}\\ =\dfrac{-7}{19}.\dfrac{11}{11}-\dfrac{12}{19}\\ =-\dfrac{7}{19}-\dfrac{12}{19}\\ =\dfrac{-7-12}{19}\\ =\dfrac{-19}{19}=-1\)
\(\dfrac{-7}{19}\cdot\dfrac{8}{11}-\dfrac{7}{19}\cdot\dfrac{3}{11}-\dfrac{12}{19}\)
\(=-\dfrac{7}{19}\cdot\left(\dfrac{8}{11}+\dfrac{3}{11}\right)-\dfrac{12}{19}\)
\(=-\dfrac{7}{19}\cdot1-\dfrac{12}{19}\)
\(=-\dfrac{19}{19}=-1\)
\(\dfrac{-7}{19}.\dfrac{8}{11}-\dfrac{7}{19}.\dfrac{3}{11}-\dfrac{12}{19}=\dfrac{-7}{19}\left(\dfrac{8}{11}+\dfrac{3}{11}\right)-\dfrac{12}{19}=\dfrac{-7}{19}.1-\dfrac{12}{19}=-1\)
`-7/19 . 8/11 - 7/19 . 3/11 - 12/19`
`= -7/19 . ( 8/11 + 3/11) - 12/19`
`= - 7/9 . 11/11 - 12/19`
`= -7/9 . 1 - 12/19`
`= -19/19 = -1`
