9f+15=-6-12f

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Solution for 9f+15=-6-12f equation: 



9f+15=-6-12f

We move all terms to the left:

9f+15-(-6-12f)=0

We add all the numbers together, and all the variables

9f-(-12f-6)+15=0

We get rid of parentheses

9f+12f+6+15=0

We add all the numbers together, and all the variables

21f+21=0

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

21f=-21

f=-21/21

f=-1

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