20=3f-1

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Solution for 20=3f-1 equation: 



20=3f-1

We move all terms to the left:

20-(3f-1)=0

We get rid of parentheses

-3f+1+20=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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