-7264+(1543+7264)
=-7264+1543+7264
=(-7264+7264)+1543
=1543
(144-97)-144
=144-97-144
=(144-144)-97
=-97
(-145)-(18-145)
=-145-18+145
=(-145+145)-18
=-18
111+(-11+27)
=111-11+27
=(111-11)+27
=100+27
=127
(27+514)-(486-73)
=27+514-486+73
=(27+73)+(514-486)
=100+28
=128
(36+79)+(145-79-36)
=36+79+145-79-36
=(79-79)+(36-36)+145
=145
10-[12-(-9-1)]
10 - (12 + 9 + 1)
= 10-12-9-1
= (10 - 10) - 12
= 0 - 12
= -12
(38 - 29 + 43) - (43 + 38)
= 38 -29 + 43-43-38
= (38 -38) + (43 -43) -29
= 0 + 0-29
= -29
271 - [(-43) + 271 - (-17)]
= 271 - (-43 + 271 + 17)
= 217 + 43 - 271 -17
= (217 - 217) + (43 - 17)
= 0 + 26
= 26
-144 - [29 - (+144) - (+144)]
= -144 - (29 - 144 - 144)
= -144 - 29 +144 + 144
= (-144 + 144) - 29 + 144
= 0 - 29 +144
= -29 +144
= 115