The exterior angle of a triangle is equal to the sum of 2 opposite interior angles of the triangle.
Here,
2 opp. interior angles = 30° & (4x + 2)°
Exterior angle = (8 + 6x)°
So,
8 + 6x = 4x + 2 + 30
8 + 6x = 4x + 32
8 - 32 = 4x - 6x
-24 = -2x
=》 12 = x
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