9+9f=7f-7

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



9+9f=7f-7

We move all terms to the left:

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

We get rid of parentheses

9f-7f+7+9=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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