Choose the correct answer and Fill in the blanks:
-3--6=_____.-9/+3
Consider
-3--6-3+6=+3
Hence, -3--6=+3
-1--1=__.0/-2
-1+___=+5.-6/+6
-72--90=_____.+18/-162
-4+(___)=-12.-8/+8
0--5=__.-5/+5