Answer:
124°
Explanation:
The angles CGH and AHF have the same size.
● 7x - 72 = 3x + 40
Add 72 to both sides
● 7x - 72 + 72 = 3x + 40 + 72
● 7x = 3x + 112
Substract 3x from both sides
● 7x - 3x = 3x + 112 - 3x
● 4x = 112
Divide both sides by 4
● 4x/4 = 112/4
● x = 28
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● < CGH = 7x - 72 = 7×28 - 72 = 124°