f(n)=3(n-3)

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Solution for f(n)=3(n-3) equation: 


Simplifying
f(n) = 3(n + -3)

Multiply f * n
fn = 3(n + -3)

Reorder the terms:
fn = 3(-3 + n)
fn = (-3 * 3 + n * 3)
fn = (-9 + 3n)

Solving
fn = -9 + 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 = -9n-1 + 3

Simplifying
f = -9n-1 + 3

Reorder the terms:
f = 3 + -9n-1

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