Quick and easy math problem

I'm having trouble with this problem:

Lines u and v intersect, creating <1 and <2, as shown. Determine the measure of <1 if m<1= 85°+2d and m<2=125°-d

Here's the picture:http://img857.imageshack.us/i/mathproble…

So I solved it like this:

85+2d+125-d=180

Then I combined like terms and got

210+1d=180

Then I subtracted 210 from both sides and got

1d=-30

And the final answer comes out to be -30...

But how can an angle be negative? What did I do wrong? Please help! :)

D was not the angle. It had asked you for the measure of <1. You did not do anything wrong. However, you stopped too early because -30 equaled d; Not m<1. Let's start at the point where you knew d was -30. After doing that, you would substitute -30 for d in m<1= 85°+2d.

m<1= 85°+2d
m<1= 85°-60
m<1= 25°
I hoped this helped.