f(2)=f(1)-1-5

Solution for f(2)=f(1)-1-5 equation:

Simplifying
f(2) = f(1) + -1 + -5

Reorder the terms for easier multiplication:
2f = f(1) + -1 + -5

Reorder the terms for easier multiplication:
2f = 1f + -1 + -5

Reorder the terms:
2f = -1 + -5 + 1f

Combine like terms: -1 + -5 = -6
2f = -6 + 1f

Solving
2f = -6 + 1f

Solving for variable 'f'.

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

Add '-1f' to each side of the equation.
2f + -1f = -6 + 1f + -1f

Combine like terms: 2f + -1f = 1f
1f = -6 + 1f + -1f

Combine like terms: 1f + -1f = 0
1f = -6 + 0
1f = -6

Divide each side by '1'.
f = -6

Simplifying
f = -6