Choose the correct answer and Fill in the blanks:
0--5=__.-5/+5
Consider
0--50+5=+5
Hence, 0--5=+5
0+-5=__.-5/+5
-1--1=__.0/-2
-1+___=+5.-6/+6
-72--90=_____.+18/-162
-4+(___)=-12.-8/+8