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answered 2012-03-09 13:42:48 +0200
I have no problems with 5:
sage: solve((log((x*2 - x), 6) - log((6x - 10), 6) == 0),
x,to_poly_solve=True)
[x == 2, x == 5]
updated 2012-03-09 14:18:45 +0200