20=6-2f

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Solution for 20=6-2f equation: 



20=6-2f

We move all terms to the left:

20-(6-2f)=0

We add all the numbers together, and all the variables

-(-2f+6)+20=0

We get rid of parentheses

2f-6+20=0

We add all the numbers together, and all the variables

2f+14=0

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

2f=-14

f=-14/2

f=-7

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