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**Title:** How do I fix the "ReferenceError: x is not defined" in JavaScript?

**Description:**
I'm getting a ReferenceError when running my JS code. Here's the snippet:

```js
console.log(x);
let x = 5;
```

**What I've tried:**
- Moved the `console.log` after the declaration (it worked)
- Searched MDN docs

**Tags:** javascript, error