I am really stuck with a negative feedback equation! I am learning the basics of op-amps on my music tech. course!

If I was to calculate the output voltage of the closed loop gain circuit when the input voltage is 14mV and the negative feedback voltage is 4mV where would I start?

This is probably really simple stuff but I am a complete newbie to all this and finding it a bit hard to get my head around at the moment!

Thanks for any help you can provide!

-Neil-