f=2f+f=20

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Solution for f=2f+f=20 equation: 



f=2f+f=20

We move all terms to the left:

f-(2f+f)=0

We add all the numbers together, and all the variables

f-(+3f)=0

We get rid of parentheses

f-3f=0

We add all the numbers together, and all the variables

-2f=0

f=0/-2

f=0

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