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x° = 60/12
x° = 5°
12x° + (x + 5y)° = 180° (saling berpelurus)
60° + 5° + 5y° = 180°
65° + 5y° = 180°
5y° = 180° - 65°
5y° = 115°
y° = 115° / 5
y° = 23°
x° + y° = 5° + 23°
= 28°