f(3)=-2x-4

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Solution for f(3)=-2x-4 equation: 


Simplifying
f(3) = -2x + -4

Reorder the terms for easier multiplication:
3f = -2x + -4

Reorder the terms:
3f = -4 + -2x

Solving
3f = -4 + -2x

Solving for variable 'f'.

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

Divide each side by '3'.
f = -1.333333333 + -0.6666666667x

Simplifying
f = -1.333333333 + -0.6666666667x

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