13=3+f

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Solution for 13=3+f equation: 



13=3+f

We move all terms to the left:

13-(3+f)=0

We add all the numbers together, and all the variables

-(f+3)+13=0

We get rid of parentheses

-f-3+13=0

We add all the numbers together, and all the variables

-1f+10=0

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

-f=-10

f=-10/-1

f=+10

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