Geometry

Question Analysis

This question involves the concept of supplementary angles.

Key Concept Explanation

Supplementary angles are two angles whose sum is 180°. When two angles are placed adjacent to each other such that they form a straight line, they are supplementary.

 

Step - by - Step Solution

1. Set up the equation based on the supplementary - angle property:

We know that .

2. Simplify the left - hand side of the equation:

Combine like terms: . So the equation becomes

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