2f=f+9

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Solution for 2f=f+9 equation: 



2f=f+9

We move all terms to the left:

2f-(f+9)=0

We get rid of parentheses

2f-f-9=0

We add all the numbers together, and all the variables

f-9=0

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

f=9

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