Question

I don’t know how to do this. Solve for x.

Answer 1

x=30°

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Answer 2

x = 30

Explanation:

the exterior angle of a triangle is equal to the sum of the 2 opposite interior angles

3x is an exterior angle of the triangle , so

3x = 2x + 30 ( subtract 2x from both sides )

3x - 2x = 2x - 2x + 30 ( simplify both sides )

x = 30