First time scripting in MonoDeveloper. Unknown ";" error.

Hello this is my first attempt making a unity game. I was writing this line of code:

 var rotation : float - Input.GetAxis ("Horizontal") * rotationSpeed;

And received this error:

Assets/BallControl.js(6,29): UCE0001: ';' expected. Insert a semicolon at the end.

As you can see there is already a ";" at the end yet I'm still receiving this error.

Thanks, Nick