F-2f+f=20

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



-2F+F=20

We move all terms to the left:

-2F+F-(20)=0

We add all the numbers together, and all the variables

-1F-20=0

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

-F=20

F=20/-1

F=-20

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