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-7-(-9)+11-(-21)+(-13) =
= -7+9+11+21-13=
=-20+41=
=21
b)
-23-24-(-25)-26 =
= -23-24+25-26=
=-73+25=
=-48
c)
16+(-25)+(-14)-21 =
=16-25-14-21=
=16-60=
=-44
d) -30+16-11+9-(-23) =
=-30+16-11+9+23=
=-41+48=
=7
b) -23-24+25-26=-73+25=-48
c) 16-25-14-21=16-60=-44
d) -30+16-11+9+23=-41+48=7