f9=2x-9

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Solution for f9=2x-9 equation: 



9=2F-9

We move all terms to the left:

9-(2F-9)=0

We get rid of parentheses

-2F+9+9=0

We add all the numbers together, and all the variables

-2F+18=0

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

-2F=-18

F=-18/-2

F=+9

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