Since both angle are congruent (equal/same), which means that both side is equal to 40 degrees, we will put the equation like this:
5x - 5 = 40
Now we’ll solve for x:
5x - 5 = 40
+ 5 + 5 (Add 5 to both sides)
5x = 45
—- —— (Five both side by 5)
5 5
x = 9
Now we left with x, so x is equal to 9.
Answer:

Step-by-step explanation:
You could either do what I did in the above answer, or you could do this:

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Answer:
39.5 degrees
Step-by-step explanation:
180-101=79
79/2=39.5