13=-8-3f

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Solution for 13=-8-3f equation: 



13=-8-3f

We move all terms to the left:

13-(-8-3f)=0

We add all the numbers together, and all the variables

-(-3f-8)+13=0

We get rid of parentheses

3f+8+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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