12f+6=9f-3

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Solution for 12f+6=9f-3 equation: 



12f+6=9f-3

We move all terms to the left:

12f+6-(9f-3)=0

We get rid of parentheses

12f-9f+3+6=0

We add all the numbers together, and all the variables

3f+9=0

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

3f=-9

f=-9/3

f=-3

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