Explicación paso a paso:
a)-13-(+21)+73-(-48)-29
-13-21+73+48-29
58
b)(-7)-{9-[(-7)+(-13)-(-5)]+23}
-7-(9-((-7)+(-13)-(-5))+23)
-7-(9-(-7-13+5)+23
-7-(9-(-15)+23)
-7-(9+15+23
-7-47
-54
8-9{9-(-10+6)}+{-11(-8)}
8-9(9-(-4))+(-11+8)
8-9(9+4)+(-3)
8-9×13-3
8-117-3
-112
