solve for x : log3^x + log9^x + log81^x = 7/4
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log3^x + log9^x + log81^x = 7/4
=>. x*log3 + x*log9 + x*log81 = 7/4
=>. x( log3 + log9 + log81) = 7/4
=>. x( log3 + log3^2 +log3^4 ) = 7/4
=>. x( log3 + 2*log3 +4*log3 ) = 7/4
=>. x*log3 (1 + 2 + 4) = 7/4
=>. x*log3 *7 = 7/4
=>. x*log3 = 1/4
=>. x = 1 / (4*log3)
=>. x = 0.5240
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