Hi,

First off the bat I need to say that I'm so bad at maths I'm not even sure what category this math problem belongs in so apologies if I've posted it in the wrong area.

The Problem:

I have this formula that I use to calculate a decibel level.

db_gain=(x * (8 / 5)) - 90;

When Using this formula db_gain value is not known and x value is known.

How can I switch around? I.E db_gain is known but x is not?

Thanks,

dub