Greetings,
The question was solve 9 ? -4 ? 8 ? 6 ? 10 = 7 by inserting (/ * + -) operators.
1- Allow relocation of numbers.
2- No operator should be used more than once.
3- Operations left to right.

My solution: 
use strict;
use Algorithm::Combinatorics qw(variations);
use feature ':5.10';

my @operators = qw(+ - * /);
my @numbers = qw(9 -4 8 6 10);
my $total = 7; #required result

my $iter = variations(\@operators, 4); #get combinations for operators
+ without rep. 
my $iter2 = variations(\@numbers, 5);  #get combinations for numbers w
+ithout rep. 

while (my $p = $iter->next){
while (my $p2 = $iter2->next){

#escaping precedence
my   $eval = eval ("$p2->[0] $p->[0] $p2->[1]");
     $eval = eval ("$eval $p->[1] $p2->[2]");
     $eval = eval ("$eval $p->[2] $p2->[3]");
     $eval = eval ("$eval $p->[3] $p2->[4]");  

  if ($eval == $total){
    say "$p2->[0] ($p->[0]) $p2->[1] ($p->[1]) $p2->[2] ($p->[2]) $p2-
+>[3] ($p->[3]) $p2->[4] = $total";
    }
  }
$iter2 = variations(\@numbers, 5); #Resets the iterator
}

[download]

I hope this code sports good Perl practices.
Special thanks to MidLifeXis.

In reply to Automating solving missing Arithmetic operators by Swalif

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