Michael J. answered 09/12/15
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Log both sides of the equation.
log(2/5)x = log (8 / 125)
Bring the x down as the coefficient of the log.
xlog(2 / 5) = log(8 / 125)
Divide both sides of the equation by log(2 / 5).
x = log(8 /125) / log(2 / 5)