-20+8f=20+13f

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



-20+8f=20+13f

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

8f-13f-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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