f(-2)=3x-9

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Solution for f(-2)=3x-9 equation: 


Simplifying
f(-2) = 3x + -9

Reorder the terms for easier multiplication:
-2f = 3x + -9

Reorder the terms:
-2f = -9 + 3x

Solving
-2f = -9 + 3x

Solving for variable 'f'.

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

Divide each side by '-2'.
f = 4.5 + -1.5x

Simplifying
f = 4.5 + -1.5x

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