-2f=9+f

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Solution for -2f=9+f equation: 


Simplifying
-2f = 9 + f

Solving
-2f = 9 + f

Solving for variable 'f'.

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

Add '-1f' to each side of the equation.
-2f + -1f = 9 + f + -1f

Combine like terms: -2f + -1f = -3f
-3f = 9 + f + -1f

Combine like terms: f + -1f = 0
-3f = 9 + 0
-3f = 9

Divide each side by '-3'.
f = -3

Simplifying
f = -3

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