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(if this were a problem that involved much larger values, say A32 and A28 it would be beneficial to see this pattern as Ax = 2^(x-1)x as shown above. however, if we're dealing with A5 and A2 we can think of it the first way because it's the easiest approach)
Now that we have the values for A5 and A2 we can set up a formula and solve for x (which represents A1)
A5-A2 = 16x-2x = 12 14x = 12 x = 12/14 = 6/7
and BAM! You're finished and that's all there is to it!
You'll have to forgive Walker. He's a certified math god and operates on a higher plane of quant logic than anyone I've seen . Walker can create an simply elegant formula for any problem you throw at him and solve it accurately.