# for the equation:  3x + 2y + 10z = 50

($x,$y,$z,$ans) = (3,2,10,50);
$xpat = 0 x $x;
$ypat = 0 x $y;
$zpat = 0 x $z;

if ((0 x $ans) =~ /^ ((?:$xpat)+) ((?:$ypat)+) ((?:$zpat)+) $/x) {
  print "x = ", length($1)/$x, "\n";
  print "y = ", length($2)/$y, "\n";
  print "z = ", length($3)/$z, "\n";
}