I need to get the text from the span using css selector, but excluding the text inside sup:

```
<span>(6-4, 7-6<sup>4</sup>)</span>

```

I tried this css selector but didn't worked:

```
span :not(sup)
# soup.select_one('span :not(sup)').text

```

The result I need is like this:
"(6-4, 7-6)"