2f+9=12

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Solution for 2f+9=12 equation: 



2f+9=12

We move all terms to the left:

2f+9-(12)=0

We add all the numbers together, and all the variables

2f-3=0

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

2f=3

f=3/2

f=1+1/2

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