I think its V15
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5a
In the series, Z3 Y6 X9 W12, then next step is V15. The letters in the series on going backward from Z to V and the numbers are in multiples of 3.
The sequence is formed by subtracting 89 at the first step and then reducing this figure by 9 at each successive step. 298 - 89 = 209 209 - 80 = 129 129 - 71 = 58 58 - 62 = -4 -4 - 53 = -57........this is the next number in the series.
I suggest that the next step should be identifying "this" expression.
Isolating a variable in one of the equations.