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$a = 5;
$b = 5;
$c = 5;
if ((($a == $b ) + ($a -1)) == $c) { print "yes!!!\n"; }

$a = 6;
$b = 5;
$c = 5;
if ((($a == $b ) + ($a -1)) == $c) { print "yes!!!\n"; }

# given three equal variables
if (($a == $b ) == ($b == $c)) { print "yes!!!\n"; }

$a = 6;
$b = 4;
$c = 5;
if (($a == $b ) == ($b == $c)) { print "yes!!!\n"; }