9th term is 38; 14th term is 63
14-9 is 5 is the difference in the number of terms
63-38 = 25 is the difference in the quantity of the terms
25/5 gives you the difference between each term in this case 5
so if 5 is the difference between each term then
5*9 is the difference between the first term and the ninth term = 40
38 (the 9th term) - 40 (the difference between 1st and 9th) gives you the 1st term = -2
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