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U5 = a+ 4b =-4
-2b = -6
b= 3
U3 = a + 2b = -10
a + 6 = -10
a = -16
S15 = 15/2 (2(-16) + 14 (3))
= 15/2 ( -32 + 42)
= 15/2 (10)
= 75