4-2f=20

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Solution for 4-2f=20 equation: 



4-2f=20

We move all terms to the left:

4-2f-(20)=0

We add all the numbers together, and all the variables

-2f-16=0

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

-2f=16

f=16/-2

f=-8

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