f(x)=3x^5+12x^4+9x^3

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Solution for f(x)=3x^5+12x^4+9x^3 equation: 


Simplifying
f(x) = 3x5 + 12x4 + 9x3

Multiply f * x
fx = 3x5 + 12x4 + 9x3

Reorder the terms:
fx = 9x3 + 12x4 + 3x5

Solving
fx = 9x3 + 12x4 + 3x5

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 9x2 + 12x3 + 3x4

Simplifying
f = 9x2 + 12x3 + 3x4

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