21=46+f

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Solution for 21=46+f equation:


Simplifying
21 = 46 + f

Solving
21 = 46 + f

Solving for variable 'f'.

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

Add '-1f' to each side of the equation.
21 + -1f = 46 + f + -1f

Combine like terms: f + -1f = 0
21 + -1f = 46 + 0
21 + -1f = 46

Add '-21' to each side of the equation.
21 + -21 + -1f = 46 + -21

Combine like terms: 21 + -21 = 0
0 + -1f = 46 + -21
-1f = 46 + -21

Combine like terms: 46 + -21 = 25
-1f = 25

Divide each side by '-1'.
f = -25

Simplifying
f = -25

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