f+f-9=3

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Solution for f+f-9=3 equation: 



f+f-9=3

We move all terms to the left:

f+f-9-(3)=0

We add all the numbers together, and all the variables

2f-12=0

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

2f=12

f=12/2

f=6

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