9+-3f=-42

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Solution for 9+-3f=-42 equation: 



9+-3f=-42

We move all terms to the left:

9+-3f-(-42)=0

We add all the numbers together, and all the variables

-3f+51=0

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

-3f=-51

f=-51/-3

f=+17

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