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Answer:
D: 27
Explanation:
The angle represented by x + 72 and 3x can be combined to form 180.
So you have to plug in the options for x and add the results of both angles.
If X = 27
27 + 72 = 99 and 3 * 27 = 81
99 + 81 = 180
Thus, 27 is your answer.