`3/13 . 6/11 + 3/13 . 9/11 - 3/13 . 4/11`
`= 3/13 . (6/11 + 9/11 - 4/11)`
`= 3/13 . 11/11`
`= 3/13 . 1 = 3/13`
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\(=\dfrac{3}{13}\left(\dfrac{6}{11}+\dfrac{9}{11}-\dfrac{4}{11}\right)\)
\(=\dfrac{3}{13}\times\dfrac{11}{11}=\dfrac{3}{13}\)
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