The Problem:
Let a, b, c and x be distinct, positive, non-unit numbers (a, b, c, x > 1) such that:
c + log mb a ≠ 0.
Rewrite the following using only x as a base:
a {log a/c + log mb a} ≠ 0.
Solution:
a( log b a /c + log b a ) - 1 = a(c + log b a / log b a )
= a (c / log b a +1)
= aa (c / log b a)
= aa (c / 1/log a b)
 =   aac log a b
 =   aa log a b c
=   ab c
 =   ax log x b c
=   ax c log x b 
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