3f-8=13

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Solution for 3f-8=13 equation: 



3f-8=13

We move all terms to the left:

3f-8-(13)=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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