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a = 87 1/2 = 87,5
b = 84 - 87,5 = -3,5
Un = 0
a + (n - 1)b = 0
87,5 + (n - 1)(-3,5) = 0
(n - 1)(-3,5) = -87,5
(n - 1) = -87,5 / -3,5
(n - 1) = 25
n = 26