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{math} not working on prestashop 1.7.5

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hi, i'm trying to show a simple math result into my miniatures/product.tpl but is not working.

The code i'm using is:

{* $height=4, $width=5 *}
{math equation="x + y" x=$height y=$width}

The above example will output 9... 

Some help? Thanks!

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Hello:

You can't just copy directly from smarty doc. This is a comment {* $height=4, $width=5 *}  not a variable declaracion. $height and $width must be defined before operation. Try with static values or a defined variable.

Regards

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