As promised, here are my solutions to the question posed.

1. 

\(6328-4469 = 2|-1|-4|-1 = 1|9|-4|-1 = 1|8|6|-1 = 1|8|5|9 = 1859\)

\(78390231 – 32495846 = 4|6|-1|0|-5|-6|-1|-5\)

\( = 4|5|9|0|-5|-6|-1|-5\)

\(= 4|5|8|10|-5|-6|-1|-5\)

\(= 4|5|8|9|5|-6|-1|-5\)

\(= 4|5|8|9|4|4|-1|-5\)

\(= 4|5|8|9|4|3|9|-5\)

\(= 4|5|8|9|4|3|8|5 = 45894385\)

I personally find it much easier to do the unexplosions from left to right.

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