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.
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?