9f+9=-7f-12+13f

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Solution for 9f+9=-7f-12+13f equation: 



9f+9=-7f-12+13f

We move all terms to the left:

9f+9-(-7f-12+13f)=0

We add all the numbers together, and all the variables

9f-(6f-12)+9=0

We get rid of parentheses

9f-6f+12+9=0

We add all the numbers together, and all the variables

3f+21=0

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

3f=-21

f=-21/3

f=-7

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