f[n]=n+2n+5

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Solution for f[n]=n+2n+5 equation: 


Simplifying
f[n] = n + 2n + 5

Multiply f * n
fn = n + 2n + 5

Reorder the terms:
fn = 5 + n + 2n

Combine like terms: n + 2n = 3n
fn = 5 + 3n

Solving
fn = 5 + 3n

Solving for variable 'f'.

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

Divide each side by 'n'.
f = 5n-1 + 3

Simplifying
f = 5n-1 + 3

Reorder the terms:
f = 3 + 5n-1

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