31=f-9

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Solution for 31=f-9 equation:


Simplifying
31 = f + -9

Reorder the terms:
31 = -9 + f

Solving
31 = -9 + 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.
31 + -1f = -9 + f + -1f

Combine like terms: f + -1f = 0
31 + -1f = -9 + 0
31 + -1f = -9

Add '-31' to each side of the equation.
31 + -31 + -1f = -9 + -31

Combine like terms: 31 + -31 = 0
0 + -1f = -9 + -31
-1f = -9 + -31

Combine like terms: -9 + -31 = -40
-1f = -40

Divide each side by '-1'.
f = 40

Simplifying
f = 40

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