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a = 85(1) - 5()
a = 80
Sn = 85n - 5
Sn-1 = 85(n-1) - 5
Un = Sn - Sn-1
Un = 90 - 10n
Un = a + (n-1)b
U2 = a + b
90 - 10(2) = 80 + b
70 = 80 + b
b = -10
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