By taking natural logarithms of both sides of the equation, solve the equation 5e³x = 12.
a) x = 1/3 ln(12/5)
b) x = 1/3 ln(5/12)
c) x = 1/3 ln(12) - 1/3 ln(5)
d) x = 1/3 ln(5) - 1/3 ln(12)