13=34-3f

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Solution for 13=34-3f equation: 



13=34-3f

We move all terms to the left:

13-(34-3f)=0

We add all the numbers together, and all the variables

-(-3f+34)+13=0

We get rid of parentheses

3f-34+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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