Answer: x=-0.35835...
Explanation:
since we have e in the equation, I would recommend using ln() instead of log(), because ln will instantly remove e from the equation, making it easier to compute x, so we have e^(-5x)=6, lets do ln() on both sides, so now we have ln(e)^(-5x)=ln(6), ln will instantly remove e, so now we are left with -5x=ln(6), now we just have to divide both sides by -5, which will give is x=(ln(6))/-5, which is x=-0.35835... the answer is non-terminating decimal but you can always round it up.
Hope it helped