f(x)=3x+12x-9

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Solution for f(x)=3x+12x-9 equation: 


Simplifying
f(x) = 3x + 12x + -9

Multiply f * x
fx = 3x + 12x + -9

Reorder the terms:
fx = -9 + 3x + 12x

Combine like terms: 3x + 12x = 15x
fx = -9 + 15x

Solving
fx = -9 + 15x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -9x-1 + 15

Simplifying
f = -9x-1 + 15

Reorder the terms:
f = 15 + -9x-1

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