fx=-x^3-2x

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Solution for fx=-x^3-2x equation: 


Simplifying
fx = -1x3 + -2x

Reorder the terms:
fx = -2x + -1x3

Solving
fx = -2x + -1x3

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -2 + -1x2

Simplifying
f = -2 + -1x2

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