Here is a sad comedy based on some `Apart`

behavior. Is there any way to do `Apart`

do the expected step?

Consider a very simple expression, such as

```
expression = (a - b + c - d)/(a - b);
```

If we were to consider how to take this expression `Apart`

to simplify it, I would say that the simplest step I can think of is to write

1+ (c – d) / (a - b)

canceling the obvious `a-b`

combination in numerator and denominator.

Now, let's see if Mathematica 11.3 in Windows 10 would produce the same result.

```
expression//Apart
```

…*irons*