12-6f=-42

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Solution for 12-6f=-42 equation: 



12-6f=-42

We move all terms to the left:

12-6f-(-42)=0

We add all the numbers together, and all the variables

-6f+54=0

We move all terms containing f to the left, all other terms to the right

-6f=-54

f=-54/-6

f=+9

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