9+9-3f=f-10

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Solution for 9+9-3f=f-10 equation: 



9+9-3f=f-10

We move all terms to the left:

9+9-3f-(f-10)=0

We add all the numbers together, and all the variables

-3f-(f-10)+18=0

We get rid of parentheses

-3f-f+10+18=0

We add all the numbers together, and all the variables

-4f+28=0

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

-4f=-28

f=-28/-4

f=+7

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