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A+bn-b
suku 4= A +4b-b = A + 3b = 7
bearti sku 6 = A + 5b
suku 8 = A + 7B
A+5b + A + 7b = 23
2A + 12b =23
dielminasi sama=
2A + 12b = 23
2(A + 3b = 7)= 2A+6B=14
2a + 12b =23
2a + 6b = 14
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6b = 9
b = 3/2
a + 3b = 7
a + 3(3/2) = 7
a + 9/2 = 7
2a + 9 = 14
2a = 14 - 9
2a = 5
a = 5/2
5/2 + (n-1) 3/2
5/2 + 3/2n - 3/2 x2
(5 + 3n - 3)/2
(3n + 2)/2
suku 20 = 3(20) + 2 = 62/2 = 31