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mondeo

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I'm pretty sure I know the answer, but I'll bank it with a PM so as not to ruin it for other folks.
 

Hawkshot99

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The subrtracting will always give you a multiple of 9. 9, 18, 27, 36...... Look at all the multiples of 9 on the chart, they all have the same symbol.
 

mondeo

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The subrtracting will always give you a multiple of 9. 9, 18, 27, 36...... Look at all the multiples of 9 on the chart, they all have the same symbol.
Ok, I was completely wrong, but I blame it on my inability to do math rather than my logic. I was looking for that trick going in, but somehow, from 79 I got 60, and from 67 I got some other number than 54.
 
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