9f+12=-69

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Solution for 9f+12=-69 equation: 



9f+12=-69

We move all terms to the left:

9f+12-(-69)=0

We add all the numbers together, and all the variables

9f+81=0

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

9f=-81

f=-81/9

f=-9

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