Answer:
40
Explanation:
I forgot what you would call this, but basically 3x = 120. both of the angles are the same. So divide both sides of the equation by 3. 3x/3 = 120/3 and your answer is 40.
It's a bad explanation but I hope it helps!
x = 40
The angles are vertical angles. We know that vertical angles are equal
120 = 3x
Divide each side by 3
120/3 = 3x/3
40 =x
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