Question

(23+ ) + 19 = 23 + ( + 19)

Answer 1

Well in order to solve this we need to get the solution to each side. 

(23+) +19 = 23 + ( +19) 
23 + 19        23 + 19 
   = 42            = 42 

So this means 
each side equals 42 

42 = 42 

So this means there are infinite solutions 

Good Luck! :)

Answer 2

(23+_) + 19 = 23+ (_+19)

42=42