21+f=24

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Solution for 21+f=24 equation: 


Simplifying
21 + f = 24

Solving
21 + f = 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 + f = 24 + -21

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

Combine like terms: 24 + -21 = 3
f = 3

Simplifying
f = 3

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