-9f=-7f-8

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Solution for -9f=-7f-8 equation: 



-9f=-7f-8

We move all terms to the left:

-9f-(-7f-8)=0

We get rid of parentheses

-9f+7f+8=0

We add all the numbers together, and all the variables

-2f+8=0

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

-2f=-8

f=-8/-2

f=+4

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