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b = 3
Sn = n/2 (2a + (n-1)b)
S8 = 8/2 (2a + 7(3))
68 = 4 (2a + 21)
68 = 8a + 84
8a = 68 - 84
8a = - 16
a = -2
semoga membantu ya :)