-20+9f=11f+20

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Solution for -20+9f=11f+20 equation: 



-20+9f=11f+20

We move all terms to the left:

-20+9f-(11f+20)=0

We get rid of parentheses

9f-11f-20-20=0

We add all the numbers together, and all the variables

-2f-40=0

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

-2f=40

f=40/-2

f=-20

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