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a+15b = -75
-4b = 40
b = -10
a - 110 = -35
a = 75
Un = 75 -10n + 10
-415 = 85 - 10n
-500 = -10n
n = 50
S50 = 25 (150 + 49 (-10)
S50 = 25 (150 - 490)
S50 = 25 (-340) = -8500
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