A set of equations is given below:

Equation A: e = 4f + 1
Equation B: e = 3f + 5

Which of the following is a step that can be used to find the solution to the set of equations?
4f + 1= 3f
4f = 3f + 5
4f + 5 = 3f + 1
4f + 1 = 3f + 5