f(n)=12+9n

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Solution for f(n)=12+9n equation: 


Simplifying
f(n) = 12 + 9n

Multiply f * n
fn = 12 + 9n

Solving
fn = 12 + 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 = 12n-1 + 9

Simplifying
f = 12n-1 + 9

Reorder the terms:
f = 9 + 12n-1

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