You're so nearly there!
Change your block eval (eval{$z}) to a string eval (eval $z)
my $x = 3;
my $y = "2 * $x";
my $z = eval {$y};
print '$z is: ', $z, "\n";
print 'eval of $z is: ', eval $z, "\n";
update: useless-use-of-quotes-noob-error eliminated. Yes, I should know better:(
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