21x=-13-2/x

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Solution for 21x=-13-2/x equation: 


D( x )

x = 0

x = 0

x = 0

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

21*x = -(2/x)-13 // + -(2/x)-13

21*x+2/x+13 = 0

21*x^1+2*x^-1+13*x^0 = 0

(21*x^2+13*x^1+2*x^0)/(x^1) = 0 // * x^2

x^1*(21*x^2+13*x^1+2*x^0) = 0

x^1

21*x^2+13*x+2 = 0

21*x^2+13*x+2 = 0

DELTA = 13^2-(2*4*21)

DELTA = 1

DELTA > 0

x = (1^(1/2)-13)/(2*21) or x = (-1^(1/2)-13)/(2*21)

x = -2/7 or x = -1/3

x in { -1/3, -2/7} 

x in { -1/3, -2/7 }

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