12=-7f-9

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Solution for 12=-7f-9 equation:


Simplifying
12 = -7f + -9

Reorder the terms:
12 = -9 + -7f

Solving
12 = -9 + -7f

Solving for variable 'f'.

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

Add '7f' to each side of the equation.
12 + 7f = -9 + -7f + 7f

Combine like terms: -7f + 7f = 0
12 + 7f = -9 + 0
12 + 7f = -9

Add '-12' to each side of the equation.
12 + -12 + 7f = -9 + -12

Combine like terms: 12 + -12 = 0
0 + 7f = -9 + -12
7f = -9 + -12

Combine like terms: -9 + -12 = -21
7f = -21

Divide each side by '7'.
f = -3

Simplifying
f = -3

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