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66 = 6z
z = 66 : 6
z = 11
sudut D
(360 - (66 x 2)) : 2
(360-132) : 2
228 : 2
114
maka
9z + y = 114
9(11) + y = 114
99 + y = 114
y = 114 - 99
y = 15
sehinga y = 15, z = 11