f(5)=f(5-1)+4

Solution for f(5)=f(5-1)+4 equation:

Simplifying
f(5) = f(5 + -1) + 4

Reorder the terms for easier multiplication:
5f = f(5 + -1) + 4

Combine like terms: 5 + -1 = 4
5f = f(4) + 4

Reorder the terms for easier multiplication:
5f = 4f + 4

Reorder the terms:
5f = 4 + 4f

Solving
5f = 4 + 4f

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Add '-4f' to each side of the equation.
5f + -4f = 4 + 4f + -4f

Combine like terms: 5f + -4f = 1f
1f = 4 + 4f + -4f

Combine like terms: 4f + -4f = 0
1f = 4 + 0
1f = 4

Divide each side by '1'.
f = 4

Simplifying
f = 4