12+-9f=-69

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Solution for 12+-9f=-69 equation: 



12+-9f=-69

We move all terms to the left:

12+-9f-(-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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