21+f=61

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Solution for 21+f=61 equation: 


Simplifying
21 + f = 61

Solving
21 + f = 61

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 = 61 + -21

Combine like terms: 21 + -21 = 0
0 + f = 61 + -21
f = 61 + -21

Combine like terms: 61 + -21 = 40
f = 40

Simplifying
f = 40

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