(- ..args)
  args: zero or more nums
  returns a num

Subtraction or negation.

(-) returns 0.

(- x) negates its argument: (- 3) returns -3, (- -0.0) returns 0.0.

With two or more arguments, subtraction is performed sequentially from left to right. Subtracting an integer from a float, or vice-versa, produces a float.