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10. x = 90°
11. x + 2x + 6x = 180
9x = 180
x = 20°
<A = 20°
<B = 40°
<C = 120°
12. <DBH = 125°
<EDG = 125°
<CED = 35°
<ECD = 90°
13. 3y = 2y + 25
y = 25°
3y = 75°
3y = x+15
75 = x + 15
x = 50°
14. <CGF = 110°
<BFG = 140°
<CGH = 70°
<BCG = 70°
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