The answer is... 15 !
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(3n + 15) / 2
15 plus -3 equals 12 12 divided by -6 equals -2
(3x+15)/2
15 + 15 / 3 + 2 Applying the rules of precedence (BIDMAS/BODMAS), division comes first so: 15 + 5 + 2 and then 20 + 2 = 22
It equals 0.172 with the two repeating.