Never but only in a trick question because:-
13 as a Roman numeral is XIII and halving it = VIII = 8
Likewise 9 as a Roman numeral is IX and halving it = IV = 4
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2x + 5 = 13 2x = 8 2x/2 = 8/2 x=4
4.6154
zero, one half equals five tenths, just as 4/8 and 2/4
8 plus 5 equals 13
(1/2) x (3-1/4) = (1/2) x (13/4) = 13/8