12+5f=2f-9

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Solution for 12+5f=2f-9 equation: 



12+5f=2f-9

We move all terms to the left:

12+5f-(2f-9)=0

We get rid of parentheses

5f-2f+9+12=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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