f(x)=x-x^3

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Solution for f(x)=x-x^3 equation: 


Simplifying
f(x) = x + -1x3

Multiply f * x
fx = x + -1x3

Solving
fx = x + -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 = 1 + -1x2

Simplifying
f = 1 + -1x2

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