You can
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5* = 100
* log 5 = log 100
* = log 100/log 5
* = 2/log 5
another method is to use trial and error
* 5* comment
1 5 too small
3 125 too big
2 25 too small
2.5 55.9 too small
2.7 77.13 too small
2.9 106 too big
2.85 98.2 too small
2.87 101.82 too big
ans approx = 2.86
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