f(x)=3+9

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Solution for f(x)=3+9 equation: 


Simplifying
f(x) = 3 + 9

Multiply f * x
fx = 3 + 9

Combine like terms: 3 + 9 = 12
fx = 12

Solving
fx = 12

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 12x-1

Simplifying
f = 12x-1

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