81-f=42

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Solution for 81-f=42 equation:


Simplifying
81 + -1f = 42

Solving
81 + -1f = 42

Solving for variable 'f'.

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

Add '-81' to each side of the equation.
81 + -81 + -1f = 42 + -81

Combine like terms: 81 + -81 = 0
0 + -1f = 42 + -81
-1f = 42 + -81

Combine like terms: 42 + -81 = -39
-1f = -39

Divide each side by '-1'.
f = 39

Simplifying
f = 39

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