3f-18=-39

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Solution for 3f-18=-39 equation: 



3f-18=-39

We move all terms to the left:

3f-18-(-39)=0

We add all the numbers together, and all the variables

3f+21=0

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

3f=-21

f=-21/3

f=-7

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