-4=F2(x-9)

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Solution for -4=F2(x-9) equation: 



-4=2(F-9)

We move all terms to the left:

-4-(2(F-9))=0



We calculate terms in parentheses: -(2(F-9)), so:

2(F-9)

We multiply parentheses

2F-18

Back to the equation:

-(2F-18)



We get rid of parentheses

-2F+18-4=0

We add all the numbers together, and all the variables

-2F+14=0

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

-2F=-14

F=-14/-2

F=+7

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