6f-9=3f+12

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



6f-9=3f+12

We move all terms to the left:

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

We get rid of parentheses

6f-3f-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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