f[n]=n-1

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Solution for f[n]=n-1 equation: 


Simplifying
f[n] = n + -1

Multiply f * n
fn = n + -1

Reorder the terms:
fn = -1 + n

Solving
fn = -1 + n

Solving for variable 'f'.

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

Divide each side by 'n'.
f = -1n-1 + 1

Simplifying
f = -1n-1 + 1

Reorder the terms:
f = 1 + -1n-1

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