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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