Write a list of steps that are needed to find the measure of _hjg.

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Step 1: 
Look at CJD, DJE and EJF. They form a straight angle so will add up to 180°. Two of the measures are given, so you can figure DJE. 

Step 2: 
Then DJE and HJG are vertical angles (opposite angles formed by intersecting lines). They have the same measure.

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