.baz {
  border-right-width: 0px;
}

.foo {
  margin: 0px;
  padding: 0;
}

.bar {
  padding: 5px 0 0px;
}

$foo: 0px;
$bar: '0px';

.foo {
  @if $bar == 0 {
    content: 'bar';
  }

  @if $foo == '0px' {
    content: 'foo';
  }
}