For a linear equation it could look like this (and yes, it took me more than 15 minutes...) 

use strict;
use warnings;

my $equation = "(2*(4*x-8)+3*x)-(10*x+1-9)"; # " = 0" omitted
$equation =~ s/x/\$_[0]/g;
my $eval = sub { eval $equation };
my $val1 = $eval->(0);
my $val2 = $eval->(1);
die "No solution for this equation\n" unless $val1 - $val2;
my $result = -$val1 / ($val2 - $val1);

printf "Result is %.10f\n", $result;

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In reply to Re^4: Reverse Polish Notation Question by hdb
in thread RPN Question by nat47

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