13+|-128|-2 (-115)-18+115 26+59+145-59-26

a) 13+|-128|-2

= 13 + 128 – 2

= 141 – 2

= 139

b) (-115)-18+115

= (-115)+115-18

= 0 – 18

= -18

c) 26+59+145-59-26

= 85       +   (86    – 26)

=  85       +     60

=  145