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Best Answer
9x = 243
ln(9x) = ln(243)
xln(9) = ln(243)
x = ln(243)/ln(9)
x = 2.5
NB this works with log10 too.
NBB if you don't have a calculator, this kinda question will only have easy values of x like integer values or 0.5, so its always worth chucking numbers in.
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