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D( x )
x = 0
x+9 = 0
5*x = 0
x = 0
x = 0
x+9 = 0
x+9 = 0
x+9 = 0 // - 9
x = -9
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:-9) U (-9:0) U (0:+oo)
10/x-(3/(5*x)) = 2/(x+9) // - 2/(x+9)
10/x-(2/(x+9))-(3/(5*x)) = 0
10/x-2*(x+9)^-1+(-3/5)*x^-1 = 0
10/x-2/(x+9)-3/(5*x) = 0
(-2*5*x*x)/(5*x*x*(x+9))+(5*10*x*(x+9))/(5*x*x*(x+9))+(-3*x*(x+9))/(5*x*x*(x+9)) = 0
5*10*x*(x+9)-3*x*(x+9)-2*5*x*x = 0
40*x^2-3*x^2+450*x-27*x = 0
37*x^2+423*x = 0
37*x^2+423*x = 0
x*(37*x+423) = 0
37*x+423 = 0 // - 423
37*x = -423 // : 37
x = -423/37
x*(x+423/37) = 0
(x*(x+423/37))/(5*x*x*(x+9)) = 0
(x*(x+423/37))/(5*x*x*(x+9)) = 0 // * 5*x*x*(x+9)
x*(x+423/37) = 0
( x+423/37 )
x+423/37 = 0 // - 423/37
x = -423/37
( x )
x = 0
x in { 0}
x = -423/37
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