21-3f=9

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Solution for 21-3f=9 equation: 


Simplifying
21 + -3f = 9

Solving
21 + -3f = 9

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 + -3f = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -3f = 9 + -21
-3f = 9 + -21

Combine like terms: 9 + -21 = -12
-3f = -12

Divide each side by '-3'.
f = 4

Simplifying
f = 4

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