9-21/x=4+4x

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Solution for 9-21/x=4+4x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

9-(21/x) = 4*x+4 // - 4*x+4

9-(4*x)-(21/x)-4 = 0

9-4*x-21*x^-1-4 = 0

5*x^0-4*x^1-21*x^-1 = 0

(5*x^1-4*x^2-21*x^0)/(x^1) = 0 // * x^2

x^1*(5*x^1-4*x^2-21*x^0) = 0

x^1

5*x-4*x^2-21 = 0

5*x-4*x^2-21 = 0

DELTA = 5^2-(-21*(-4)*4)

DELTA = -311

DELTA < 0

x in { } 

x belongs to the empty set

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