F(x)=x(x)-21/x+2

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



(F)=F(F)-21/F+2

We move all terms to the left:

(F)-(F(F)-21/F+2)=0



Domain of the equation: F+2)!=0

F∈R



We get rid of parentheses

F-FF+21/F-2=0

We multiply all the terms by the denominator


F*F-FF*F-2*F+21=0

We add all the numbers together, and all the variables

-2F+F*F-FF*F+21=0

Wy multiply elements

F^2-1F^2-2F+21=0

We add all the numbers together, and all the variables

-2F+21=0

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

-2F=-21

F=-21/-2

F=10+1/2

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