fx=x^2-7x

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Solution for fx=x^2-7x equation: 


Simplifying
fx = x2 + -7x

Reorder the terms:
fx = -7x + x2

Solving
fx = -7x + x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -7 + x

Simplifying
f = -7 + x

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