f(x)=x*(20-x)

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Solution for f(x)=x*(20-x) equation: 


Simplifying
f(x) = x(20 + -1x)

Multiply f * x
fx = x(20 + -1x)
fx = (20 * x + -1x * x)
fx = (20x + -1x2)

Solving
fx = 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 = 20 + -1x

Simplifying
f = 20 + -1x

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