-2f=-7-f

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Solution for -2f=-7-f equation: 



-2f=-7-f

We move all terms to the left:

-2f-(-7-f)=0

We add all the numbers together, and all the variables

-2f-(-1f-7)=0

We get rid of parentheses

-2f+1f+7=0

We add all the numbers together, and all the variables

-1f+7=0

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

-f=-7

f=-7/-1

f=+7

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