What is the length of side bc of the triangle? make sure to show all of your work!

For other ppl looking at this question here's the answer.
First you have to put  and  equal
Like this 
Then you have to get x on one side 
So Add 1 to both sides which cancels out the 
And you have  left 
Then subtract x from both sides 
And you get .
hope this helps you; if you need help pm me :).

The answer is 76° i believe