f(n)=5n+4n

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Solution for f(n)=5n+4n equation:


Simplifying
f(n) = 5n + 4n

Multiply f * n
fn = 5n + 4n

Combine like terms: 5n + 4n = 9n
fn = 9n

Solving
fn = 9n

Solving for variable 'f'.

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

Divide each side by 'n'.
f = 9

Simplifying
f = 9

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