f(x)=-.2x^2+20

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Solution for f(x)=-.2x^2+20 equation: 


Simplifying
f(x) = -0.2x2 + 20

Multiply f * x
fx = -0.2x2 + 20

Reorder the terms:
fx = 20 + -0.2x2

Solving
fx = 20 + -0.2x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 20x-1 + -0.2x

Simplifying
f = 20x-1 + -0.2x

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