-f=f-20

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Solution for -f=f-20 equation: 



-f=f-20

We move all terms to the left:

-f-(f-20)=0

We add all the numbers together, and all the variables

-1f-(f-20)=0

We get rid of parentheses

-1f-f+20=0

We add all the numbers together, and all the variables

-2f+20=0

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

-2f=-20

f=-20/-2

f=+10

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