This my first post on your forum and im sure it wont be my last

I have this equation...

Delta G^0 = -RT * lnK

and i need to solve for K, i have this;

delta G^0 = -RT*lnK - i get this

ln K = -(delta G^0 / RT) --

**but i do not get this step- there is obviously a rule that i can think of or something can someone help me understand?**

k = e ^ -(delta G^0 / RT) - i get this

Please and thank you