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5y = 180°
y =
y = 36°
3y + x = 180°
3(36) + x = 180°
108° + x = 180°
x = 180 - 108 = 72°
jadi x + y = 72° + 36° = 108°
yg nomer 7 aja ya soalnya yg nomer 6 tulisannya agak gak jelas...
jadikan yg terbaik ya :D