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D( x )
x+11 = 0
x = 0
11*x+33 = 0
x+11 = 0
x+11 = 0
x+11 = 0 // - 11
x = -11
x = 0
x = 0
11*x+33 = 0
11*x+33 = 0
11*x+33 = 0 // - 33
11*x = -33 // : 11
x = -33/11
x = -3
x in (-oo:-11) U (-11:-3) U (-3:0) U (0:+oo)
1/(x+11)+1/x = 21/(11*x+33) // - 21/(11*x+33)
1/(x+11)-(21/(11*x+33))+1/x = 0
1/(x+11)-21*(11*x+33)^-1+1/x = 0
1/(x+11)-21/(11*x+33)+1/x = 0
(1*x*(11*x+33))/(x*(x+11)*(11*x+33))+(-21*x*(x+11))/(x*(x+11)*(11*x+33))+(1*(x+11)*(11*x+33))/(x*(x+11)*(11*x+33)) = 0
1*x*(11*x+33)-21*x*(x+11)+1*(x+11)*(11*x+33) = 0
11*x^2-10*x^2-198*x+154*x+363 = 0
x^2-44*x+363 = 0
x^2-44*x+363 = 0
x^2-44*x+363 = 0
DELTA = (-44)^2-(1*4*363)
DELTA = 484
DELTA > 0
x = (484^(1/2)+44)/(1*2) or x = (44-484^(1/2))/(1*2)
x = 33 or x = 11
(x-11)*(x-33) = 0
((x-11)*(x-33))/(x*(x+11)*(11*x+33)) = 0
((x-11)*(x-33))/(x*(x+11)*(11*x+33)) = 0 // * x*(x+11)*(11*x+33)
(x-11)*(x-33) = 0
( x-11 )
x-11 = 0 // + 11
x = 11
( x-33 )
x-33 = 0 // + 33
x = 33
x in { 11, 33 }
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