How to do arithmetic operations in Laravel blade view?

I want to do subtraction operation inside Laravel blade view. I knew it was the wrong approach I need to do it from controller,but can someone give me the proper solution to do it directly inside blade view?

Note : I am a newbie to programming.

Here is my code

@if(!empty($receipt_details->total_due))
<tr>
<th>
Customer Old Due
</th>
<td>
-
</td>
</tr>
@endif

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