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u5= a + 4b = 14
------------------- -
3b = 9
b= 9/3 = 3
a +4b = 14
a+ 4x3=14
a + 12=14
a= 2
u30= a+29b = 6+29x3
= 2 +87=89
u8 = 23
u5 = 14
a + 4b = 14
u8 = 23
a + 7b = 23
eliminasi
a + 4b = 14
a + 7b = 23 _
-3b = - 9
b = -9/-3
b= 3
substitusi
a + 4b = 14
a + 4 (3) = 14
a + 12 = 14
a = 14 - 12
a = 2
un = a + (n-1) b
u30 = a + (30-1) b
u30 = a + 29b
u30 = 2 + 29 (3)
u30 = 2 + 87
u30 = 89