Un = a + (n-1) x b
5 = 73 + (n-1) x (-2)
5 = 73 + (-2n) +2
5 -73 -2 = -2n
-70 = -2n
35 = n
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Un = a + (n-1) x b
5 = 73 + (n-1) x (-2)
5 = 73 + (-2n) +2
5 -73 -2 = -2n
-70 = -2n
35 = n