I have iput of reminder. I want to get divisive integer

Example:

15%7 = 1
14%7 = 0
9%7  = 2

Here input 1, 0, 2 and output 15, 14 and 9 

For input 5 what will be the output. Surely it may be 13. But how to get it by php coding? Suppose we don’t know the divider 7

My try

    <?php

function findNumberWithUnknownDivisor($remainder) {
    // Starting with an initial guess for the divisor
    $maxPossibleDivisor = 100; // Arbitrary large value to test possible divisors
    for ($divisor = 1; $divisor <= $maxPossibleDivisor; $divisor++) {
        for ($i = $remainder; $i < $divisor * 10; $i += $divisor) {
            if ($i % $divisor == $remainder) {
                return $i;
            }
        }
    }
    return null; // If no match is found
}

$remainder = 5;
$result = findNumberWithUnknownDivisor($remainder);

echo "A number with remainder $remainder is: $result";
?>