f(x)=30x-x^2

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Solution for f(x)=30x-x^2 equation: 


Simplifying
f(x) = 30x + -1x2

Multiply f * x
fx = 30x + -1x2

Solving
fx = 30x + -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 = 30 + -1x

Simplifying
f = 30 + -1x

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