Solve 4e6x=100

Since we have e = 2.718281828459, a becomes 10.873127313836

We need to divide each side of the equation by 10.873127313836

4e6x
10.873127313836
=
  
100
10.873127313836

e6x = 9.1969860292861

We need to solve for x, therefore, in order to remove it from the power portion, we take the natural log of both sides
Ln(e6x) = Ln(9.1969860292861)

There exists a logarithmic identity which states: Ln(an) = n * Ln(a)
Using that identity, we have n = 6x and a = e, so our equation becomes:
6xLn(e) = 2.2188758248682

Given that e = 2.718281828459, we have:

6x * Ln(2.718281828459)
(6 * 1)x = 2.2188758248682
6x = 2.2188758248682

Divide each side of the equation by 6

6x
6
=
  
2.2188758248682
6

x = 0.36981263747803