+9 or -3. Take your pick.
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3 + 12*n hours where n is any integer, negative, zero or positive.
No. One is the additive inverse of the other.
negative 12-4
12 hour clock but could say the time in a 24 hour clock Analogue describes construction, not hours. It can be either.
Twice if the clock is a 12 hour clock. Once if it is a 24 hour variant.