a + 5b = -9
a + 4b = -6
(a + 5b) - (a + 4b) = -15
b = -15
a = 51
suku ke-10 = a + 9b = 51 + -135 = -84
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a + 5b = -9
a + 4b = -6
(a + 5b) - (a + 4b) = -15
b = -15
a = 51
suku ke-10 = a + 9b = 51 + -135 = -84