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my $bad_idea1 = '$var1';
my $bad_idea2 = '$var2';
...
my $equation = "$bad_idea1 + $bad_idea2";
print "$equation\n";
print eval $equation;

my $bad_idea1 = '$var1';
my $bad_idea2 = '$var2';
...
} else {
    print $result;
}