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U3 = a + (n-1)b
30 = 252 + (3-1)b
30 - 252 = 2b
-222 = 2b
-111 = b
U7 = a + (n-1)b
U7 = 252 + (7-1) (-111)
U7 = 252 + 6 (-111)
U7 = 252 - 666
U7 = - 414