f (x) on the set of integers expressed in successive pairs {(a, 3), (b, -5), (- 2, c), (- 1, d)}. The value of a + b + c - d is .... (sorry bad if bad translations. i used google translator
I am not sure what the question means but maybe.
these are successive numbers
-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,
b c d a
2+-6+-1-0=2-6-1-0 =-5
