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y = 56°:2
y = 28°
2y+4x = 180° (dalam sepihak)
2×28°+4x = 180°
56°+4x = 180°
4x = 180°-56°
x = 124°:4
x = 31°
x+y = 31°+28°
x+y = 59°
y = 28
4x + 56 = 180
4x = 124
x = 31
x+y = 31 + 28 = 59