F(7)=2x-1

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Solution for F(7)=2x-1 equation: 



(7)=2F-1

We move all terms to the left:

(7)-(2F-1)=0

We get rid of parentheses

-2F+1+7=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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