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u9 = a+ 8b = 26 -
3b =9
b = 3
a + 5b = 17
a + 5x3 = 17
a + 15= 17
a = 2
u30 = a + 29b
= 2 + 29x3
= 2 + 87
= 89
=26 -> a+8b=26...(2)
(1) dan (2) dieliminasi jadi,
3b=9
b=3
a+5b=17
a+5(3)=17
a+15=17
a=2
=a+(n-1)b
=2+(29)3
=2+87
=89