-7264 + ( 1543 + 7264 )
=-7264+1543+7264
=(-7264+7264)+1543
=0+1543
=1543
(144 - 97 ) -144
=144-97-144
=(144-144)-97
=0-97
=-97
( -145 ) - ( 18 -145 )
=-145-18+145
=(-145+145)-18
=0-18
=-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
=(36-36)+(79-79)+145
=0+0+145
=145
( 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]
=271+43-271-17
=(271-271)+(43-17)
=0+26
=26
-144 - [ 29 - ( + 144 ) - ( + 144 ) ]
=-144-[29-144-144]
=-144-29+144+144
=(-144+144)+(-29+144)
=0+115
=115