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⇒ = a + b + a + 14b + a + 39b
⇒ 165 = 3a + 54b
⇒ 3(a + 18b) = 165
⇒ a + 18b = 55
⇒ = 55
jadi, suku ke 19 adalah 55, semoga bermanfaat yaaaa........!!!