f(4)=-x+9

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Solution for f(4)=-x+9 equation: 


Simplifying
f(4) = -1x + 9

Reorder the terms for easier multiplication:
4f = -1x + 9

Reorder the terms:
4f = 9 + -1x

Solving
4f = 9 + -1x

Solving for variable 'f'.

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

Divide each side by '4'.
f = 2.25 + -0.25x

Simplifying
f = 2.25 + -0.25x

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