-13f-20=20-8f

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Solution for -13f-20=20-8f equation: 



-13f-20=20-8f

We move all terms to the left:

-13f-20-(20-8f)=0

We add all the numbers together, and all the variables

-13f-(-8f+20)-20=0

We get rid of parentheses

-13f+8f-20-20=0

We add all the numbers together, and all the variables

-5f-40=0

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

-5f=40

f=40/-5

f=-8

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