f(-x)=7x-9

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Solution for f(-x)=7x-9 equation: 


Simplifying
f(-1x) = 7x + -9

Remove parenthesis around (-1x)
f * -1x = 7x + -9

Reorder the terms for easier multiplication:
-1f * x = 7x + -9

Multiply f * x
-1fx = 7x + -9

Reorder the terms:
-1fx = -9 + 7x

Solving
-1fx = -9 + 7x

Solving for variable 'f'.

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

Divide each side by '-1x'.
f = 9x-1 + -7

Simplifying
f = 9x-1 + -7

Reorder the terms:
f = -7 + 9x-1

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