Edit.php

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<?php
namespace Magento\Variable\Controller\Adminhtml\System\Variable;

class Edit extends \Magento\Variable\Controller\Adminhtml\System\Variable
{
    public function execute()
    {
        $variable = $this->_initVariable();

        $resultPage = $this->createPage();
        $resultPage->getConfig()->getTitle()->prepend(__('Custom Variables'));
        $resultPage->getConfig()->getTitle()->prepend(
            $variable->getId() ? $variable->getCode() : __('New Custom Variable')
        );
        $resultPage->addContent($resultPage->getLayout()->createBlock(
            \Magento\Variable\Block\System\Variable\Edit::class
        ))->addJs(
            $resultPage->getLayout()->createBlock(
                \Magento\Framework\View\Element\Template::class,
                '',
                ['data' => ['template' => 'Magento_Variable::system/variable/js.phtml']]
            )
        );
        return $resultPage;
    }
}