$x = 8
    if $x == 7;
$x = 0
    if not $x == 7;
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But that will always do two tests. If the test is expensive, or done a lot of times, it's less efficient.

But what is worse is that it's wrong. The original code ends with x being 8 if it was originally 7. Your code ends with $x being 0, all the time.

Abigail