f(x)=9-5x

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Solution for f(x)=9-5x equation: 


Simplifying
f(x) = 9 + -5x

Multiply f * x
fx = 9 + -5x

Solving
fx = 9 + -5x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 9x-1 + -5

Simplifying
f = 9x-1 + -5

Reorder the terms:
f = -5 + 9x-1

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