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Somebody please explain how to solve this by formula or theorem

Somebody please explain how to solve this by formula or theorem-example-1

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\text{It is an equilateral triangle, so all angles are equal to}~ 60^(\circ)\\\\~~~~~~m\angle 2 = x+72\\\\\implies 60 = x+72\\\\\implies x = 60-72\\\\\implies x = -12

User Helbaroudy
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