F(21)=2x-7

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Solution for F(21)=2x-7 equation: 



(21)=2F-7

We move all terms to the left:

(21)-(2F-7)=0

We get rid of parentheses

-2F+7+21=0

We add all the numbers together, and all the variables

-2F+28=0

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

-2F=-28

F=-28/-2

F=+14

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