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Answer:
The unknown angles are 45 and 63
Step-by-step explanation:
5x + 7x + 72 = 180 (angle sum property)
12x + 72 = 180
12x = 180 - 72
12x = 108
x = 108/12
x = 9
Therefore, 5x = 5*9 = 45
7x = 7*9 = 63