13=7f+6f

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Solution for 13=7f+6f equation: 



13=7f+6f

We move all terms to the left:

13-(7f+6f)=0

We add all the numbers together, and all the variables

-(+13f)+13=0

We get rid of parentheses

-13f+13=0

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

-13f=-13

f=-13/-13

f=1

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