$numPerRow: 4;
$margin: 2%;
$var: -((1 * 5 % 2) - (2 + 2 - 1));
$my-var: $var-1 + $var-2;
$var3: -100deg;
$var4: -$var3;
$var5: +$var3;
$var6: 0 20px 0 -24px;
$var7: 0 20px 0em -1px;
$var8: preserve-3d;
$var9: -($height / 2);
$var10: -($height + $width);
$var11: -($height - $width);
$var12: normal normal normal 12px/20px myfont;
$height: em(240/2);
$easing: cubic-bezier(.35, 0, .765, -0.120);
$width: ((100% - ($numPerRow * $margin)) / $numPerRow);

div {
  width: ((100% - ($numPerRow * $margin)) / $numPerRow);
  transform: translateX(-$pos);
  transform: translateX(+$pos);
  transform: translateX($pos -3);
  transform: translateX(3-1);
  font-size: percentage(12/16);
  margin-top: -($height / 2);
  top: $height * -0.1;
}

@function myFn() {
  @return -((1 * 5 % 2) - (2 + 2 - 1));
}