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D( x )
x = 0
x^2-(9*x) = 0
x-9 = 0
x = 0
x = 0
x^2-(9*x) = 0
x^2-(9*x) = 0
x^2-9*x = 0
x^2-9*x = 0
DELTA = (-9)^2-(0*1*4)
DELTA = 81
DELTA > 0
x = (81^(1/2)+9)/(1*2) or x = (9-81^(1/2))/(1*2)
x = 9 or x = 0
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x in (-oo:0) U (0:9) U (9:+oo)
2/(x-9)-(2/x) = 18/(x^2-(9*x)) // - 18/(x^2-(9*x))
2/(x-9)-(18/(x^2-(9*x)))-(2/x) = 0
2/(x-9)-18*(x^2-9*x)^-1-2*x^-1 = 0
2/(x-9)-18/(x^2-9*x)-2/x = 0
x^2-9*x = 0
x^2-9*x = 0
x*(x-9) = 0
x-9 = 0 // + 9
x = 9
x*(x-9) = 0
2/(x-9)-18/(x*(x-9))-2/x = 0
(2*x)/(x*(x-9))-18/(x*(x-9))+(-2*(x-9))/(x*(x-9)) = 0
2*x-2*(x-9)-18 = 0
2*x-2*x-18+18 = 0
0 = 0
0/(x*(x-9)) = 0
0/(x*(x-9)) = 0 // * x*(x-9)
0 = 0
x belongs to the empty set
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