2Sec(x)*tan(x)+sec(x)^2=0

I know that the answer is 210 degrees from using my graph. How would I do this by hand?

I tried this.

sec(x)(2tan(x)+sec(x))=0

I get stuck here I have also changed the sec(x)^2 to Tan(x)^2+1. But then I get stuck because I still have two different trigonometric functions. Please help. Thanks