Question

-20-6-[(-1).(10-3.7)+8-5.4]

Answer 1

-20-6-[(-1).(10-3.7)+8-5.4]
-20-6-[(-1).(10-21)+8-20]
-20-6-[(-1).(-11)+(-12)]
-20-6[11 + (-12)]
-20-6[11-12]
-20-6.[-1]
-26.[-1]
26

Answer 2

-20-6-[-10-21+8-20]
-20-6-[-31+8-20]
-20-6-[-23-20]
-20-6-[-43]
-20-6+43=
17