31=7f-9f

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Solution for 31=7f-9f equation:


Simplifying
31 = 7f + -9f

Combine like terms: 7f + -9f = -2f
31 = -2f

Solving
31 = -2f

Solving for variable 'f'.

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

Add '2f' to each side of the equation.
31 + 2f = -2f + 2f

Combine like terms: -2f + 2f = 0
31 + 2f = 0

Add '-31' to each side of the equation.
31 + -31 + 2f = 0 + -31

Combine like terms: 31 + -31 = 0
0 + 2f = 0 + -31
2f = 0 + -31

Combine like terms: 0 + -31 = -31
2f = -31

Divide each side by '2'.
f = -15.5

Simplifying
f = -15.5

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