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D( x )
x-5 = 0
x+4 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:5) U (5:+oo)
3/(x+4) = 2/(x-5) // - 2/(x-5)
3/(x+4)-(2/(x-5)) = 0
3/(x+4)-2*(x-5)^-1 = 0
3/(x+4)-2/(x-5) = 0
(3*(x-5))/((x+4)*(x-5))+(-2*(x+4))/((x+4)*(x-5)) = 0
3*(x-5)-2*(x+4) = 0
x-23 = 0
(x-23)/((x+4)*(x-5)) = 0
(x-23)/((x+4)*(x-5)) = 0 // * (x+4)*(x-5)
x-23 = 0
x-23 = 0 // + 23
x = 23
x = 23
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