DOCUMENT();
loadMacros('PGstandard.pl', 'PGML.pl', 'PGcourse.pl');

Context()->constants->add(k => 0.023431412);

Context()->flags->set(formatStudentAnswer => 'parsed');

$ans = Compute('k');

BEGIN_PGML
Let [`f(x) = x - k`] where [`k`] is a constant. Then [`f(x) = 0`] when
[`x =`] [___]{$ans}.
END_PGML

BEGIN_PGML_SOLUTION
Solution explanation goes here.
END_PGML_SOLUTION

ENDDOCUMENT();