f(x)=(x-9)

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


Simplifying
f(x) = (x + -9)

Multiply f * x
fx = (x + -9)

Reorder the terms:
fx = (-9 + x)

Remove parenthesis around (-9 + x)
fx = -9 + x

Solving
fx = -9 + x

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 + 1

Simplifying
f = -9x-1 + 1

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

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