9=2f+1

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Solution for 9=2f+1 equation: 



9=2f+1

We move all terms to the left:

9-(2f+1)=0

We get rid of parentheses

-2f-1+9=0

We add all the numbers together, and all the variables

-2f+8=0

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

-2f=-8

f=-8/-2

f=+4

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