a + 6b = 8 5th term: a + 18b = 44term 1: a + 6b = 8term 2: a + 18b = 44 term 2 - term 1: 12b = 36b = 36/12 = 3a + 6b = 8a + 6(3) = 8a = 8-18 = -10
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