Question

(-1-2).[-7.(2-5)-3.(4-2)-1]

Answer 1

(-1-2).[-7.(2-5)-3.(4-2)-1]
--3.[-7.(-3)-3.2-1]
-3.[-21-3.2-1]
-3.[-21+6-1]
-3.[-15-1]
-3.[-14]
-42