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a+b>13
(b+5)+b>13
2b+5>13
2b>8
b>4
a-5>4
a>9
: Bilangan Kedua ⇒ b
Maka:
a + b > 13
a = b + 5
a + b > 13
(b + 5) + b > 13
2b > 13 - 5
b > 4 ⇒ b = {5, 6, 7, .....}
Kemungkinan Terkecil b ⇒ 5
a = b + 5
a = 5 + 5 = 10
Kemungkinan Terkecil a ⇒ 10
a > 10 ⇒ a = {11, 12, 13, .....}