Vietnam Math Puzzle Algorithm

VietnamMathPuzzle.php

<?php
$numbers = range(1,9);
$isSolved = false;
while (!$isSolved) {
  shuffle($numbers);
  $result = $numbers[0]+13;
  $result = $result*$numbers[1];
  $result = $result/$numbers[2];
  if (!is_int($result)) continue;
  $result = $result + $numbers[3];
  $result = $result + 12;
  $result = $result * $numbers[4];
  $result = $result - $numbers[5];
  $result = $result - 11;
  $result = $result + $numbers[6];
  $result = $result * $numbers[7];
  $result = $result / $numbers[8];
  if (!is_int($result)) continue;
  if($result == 76) {
    $isSolved = true;
  }  
}
foreach ($numbers as $number) {
  echo "$number \n ";
}
?>