3f-15=-9

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Solution for 3f-15=-9 equation: 



3f-15=-9

We move all terms to the left:

3f-15-(-9)=0

We add all the numbers together, and all the variables

3f-6=0

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

3f=6

f=6/3

f=2

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