21=f-12

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Solution for 21=f-12 equation:


Simplifying
21 = f + -12

Reorder the terms:
21 = -12 + f

Solving
21 = -12 + 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 = -12 + f + -1f

Combine like terms: f + -1f = 0
21 + -1f = -12 + 0
21 + -1f = -12

Add '-21' to each side of the equation.
21 + -21 + -1f = -12 + -21

Combine like terms: 21 + -21 = 0
0 + -1f = -12 + -21
-1f = -12 + -21

Combine like terms: -12 + -21 = -33
-1f = -33

Divide each side by '-1'.
f = 33

Simplifying
f = 33

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