Since, DHG and EHG are opposite vertical angles, then;
DHG = EHG
6(x-2) = 3x + 30
6x - 12 = 3x + 30
collect like term
6x - 3x = 30 + 12
3x = 42
Divide both-side of the equation by 3
x = 14
m DHG = 6(x-2)
=6(14-2)
= 6(12)
=72°
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