Solve $\log_8y=4$log8y=4 for $y$y.
Solve $\log_{64}x=\frac{1}{3}$log64x=13 for $x$x.
Solve $\log_49x=2$log49x=2 for $x$x.
Solve $9\log_{10}x=45$9log10x=45 for $x$x.
Solve simple exponential equations.