fx=-3x^2+5x+9

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Solution for fx=-3x^2+5x+9 equation: 


Simplifying
fx = -3x2 + 5x + 9

Reorder the terms:
fx = 9 + 5x + -3x2

Solving
fx = 9 + 5x + -3x2

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 + 5 + -3x

Simplifying
f = 9x-1 + 5 + -3x

Reorder the terms:
f = 5 + 9x-1 + -3x

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