`-[-171+(171+23)]-[172-(38+172)]-49`
`=-[-171+194]-[172-210]-49`
`=-23-(-38)-49`
`=-23+38-49`
`=15-49`
`=-34`
`2750-(2085+2750)-[-483-(29-438)]`
`=2750-4835-[-483-(-409)]`
`=2750-4835-(-74)`
`=(-2085)-(-74)`
`=-2011`
`-482-(176-482)-[2750-(176+2750)]`
`=-482-(-306)-[2750-2926]`
`=-482+306-(-176)`
`=(-176)+176`
`=0`