My code in the second task does not work and I can't understand why :(

They ask me to add 5 to a Variable : $integerOne and remove 1 from a Variable: integerTwo Where my integers have the value of 1 and 2 :P

My code: <?php $integerOne = 1; $integerTwo = 2;

echo $integerOne, $integerTwo . "<br>"; ?> Here I'm trying to add the values to the integers. Whether I just don't know how to add a value to a Variable or this doesn't work. I've been trying to resolve that ez statement for like 30 minutes...

how can I add and remove a value to a Variable. I thought that this: <?php
$integerOne + 5; $integerTwo - 1; echo $integerOne, $integerTwo; ?> would have worked I watched the video and nothing tells me, how to add or remove from a variable or maybe I missed it :(

Help me ! :) Thanks

<?php
$integerOne = 1;
$integerTwo = 2;

$integerOne + 5;
$integerTwo - 1;
?>