Relation in digits can lead to relations in tan...

Given,

$\tan(\overline {xyz}^\circ ) = \tan(\overline{yxz}^\circ)$

Then, $y -x =$

NOTE-

1. $0 < \overline{xyz} , \overline{yxz} < 360$

2. $\overline {xyz}$ is a three digit number consisting of the digits $x, y$ and $z$ in that order