9-f=-9

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Solution for 9-f=-9 equation: 


Simplifying
9 + -1f = -9

Solving
9 + -1f = -9

Solving for variable 'f'.

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

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

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

Combine like terms: -9 + -9 = -18
-1f = -18

Divide each side by '-1'.
f = 18

Simplifying
f = 18

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