7=13+3f

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Solution for 7=13+3f equation: 



7=13+3f

We move all terms to the left:

7-(13+3f)=0

We add all the numbers together, and all the variables

-(3f+13)+7=0

We get rid of parentheses

-3f-13+7=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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