-2(f+-4)=20

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Solution for -2(f+-4)=20 equation: 



-2(f+-4)=20

We move all terms to the left:

-2(f+-4)-(20)=0

We add all the numbers together, and all the variables

-2(f-4)-20=0

We multiply parentheses

-2f+8-20=0

We add all the numbers together, and all the variables

-2f-12=0

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

-2f=12

f=12/-2

f=-6

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