a) `-81 - 132 - 547 + 181 - 132 - 53`
`=(181-81)-(132+132)-(547+53)`
`=100-264-600`
`=-764`
b) `50 - 2016 + 50 - 118 + 2016 - 18`
`=(50+50)-(2016-2016)-(118+18)`
`=100-136`
`=-36`
c) `254 - 49 - 75 + 254 - 175 + 549`
`=(254+254-(49-549)-(75+175)`
`=508-(-500)-250`
`=758`
d)`173 - 536 + 173 - ( 29 - 29 + 526)`
`=173-536+173-526`
`=-(173+173)-(536+526)`
`=-716`
e)`-(-171 + 171 + 223 ) - (172 - 105 + 172) + 223`
`=-223-239+223`
`=-(223-223)-239`
`=-239`