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(18a - 16) + 5a + 5a = 180
28a = 196
a = 7
∠ODC + ∠OCB = 90°
5a + 6b + 1
5 x 7 + 6b = 89
35 + 6b = 89
6b = 54
b = 9
Nilai a - 2b = 7 - (2 x 9) = 7 - 18 = -11
Jawaban: B