1. Factor Equation 
e^-3x=0 
1-3x=0 
2. Set first factor equal to 0 and solve 
e^-3x=0 
Rewrite as set of linear factors 
e^-3*x=0 
Take the natural logarithm of both sides
In(e^-3*x)=In(0)
Equation cannot be sloved because In(0)= undefined 
3. Set next factor equal to 0 and solve
1-3x=0 
Subtract 1 from both sides 
1-3x-1=0-1 
-3x=-1 
4.Divide each term by -3 and simplify 
-3x/-3= -1/-3
x=-1/-3 
4. Divide x by 1 
X= 1/3