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bil kedua: b
ab = 140
a = 3b - 1
substitusi
(3b - 1)b = 140
3b² - b - 140 = 0
(3b + 20) (b - 7) = 0
b = -20/3 atau b = 7
a dan b bil positif, jadi b = 7
a = 3.7 - 1
a = 20
selisihnya
a - b = 20 - 7 = 13
semoga membantu ya :)