21-9f=-24

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Solution for 21-9f=-24 equation: 


Simplifying
21 + -9f = -24

Solving
21 + -9f = -24

Solving for variable 'f'.

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

Add '-21' to each side of the equation.
21 + -21 + -9f = -24 + -21

Combine like terms: 21 + -21 = 0
0 + -9f = -24 + -21
-9f = -24 + -21

Combine like terms: -24 + -21 = -45
-9f = -45

Divide each side by '-9'.
f = 5

Simplifying
f = 5

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