fx=21+20x-x^2

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Solution for fx=21+20x-x^2 equation: 


Simplifying
fx = 21 + 20x + -1x2

Solving
fx = 21 + 20x + -1x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 21x-1 + 20 + -1x

Simplifying
f = 21x-1 + 20 + -1x

Reorder the terms:
f = 20 + 21x-1 + -1x

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