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Un = a + (n-1)b
U5 = a + (5 - 1)b = 14
U5 = a + 4b = 14
U8 = a + 7b = 29
a + 7b = 29
a + 4b = 14
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3b = 15
b = 5
input b = 5 ke persamaan a + 4b = 14
a + 4b = 14
a + 4(5) = 14
a + 20 = 14
a = -6