Question 296804
-x is positve (-infinity,0]  ex: -1,-2,-3...-1003,-1004,-1005,...
-x is negative [0, +infinity) ex: 1,2,3...1003,1004,1005,...
-x-1 is positive [1,+infinity) ex: 2,3...1003,1004,1005,... do not include 1
/x/=2  2,-2 if this is an absolute value sign