`L = \frac{-9}{25} . 53/3 - \frac{-24}{49} - (-3/5)^2 . 22/3 + (\frac{5}{-7})^2`
`= \frac{-9}{25} . 53/3 + 24/49 - 9/25 . 22/3 + 25/49`
`= 9/25 . (-53/3) - 9/25 . 22/3 + ( 24/49 + 25/49)`
`= 9/25 . ( -53/3 - 22/3) + 1`
`= 9/25 . (-25) + 1`
`= -9 + 1`
`= -8`