Since .69 is the log of x, then it follows that:
x=10^.69=4.8978......
To get rid of a log you must make it an exponent of its base. In this case the base of log(x) is 10 so you must start by making each side 10 to the power of whatever it is
log(x) = .69
10^(log(x)) = 10^(.69)
x = 10^(.69)
If you plug in the x value to the original equation you will get the original .69
