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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
X/(x-3)+3 = x/(x-3) // - x/(x-3)
X/(x-3)-(x/(x-3))+3 = 0
X/(x-3)+(-1*x)/(x-3)+3 = 0
X/(x-3)+(-1*x)/(x-3)+(3*(x-3))/(x-3) = 0
3*(x-3)+X-1*x = 0
X-x+3*x-9 = 0
X+2*x-9 = 0
(X+2*x-9)/(x-3) = 0
(X+2*x-9)/(x-3) = 0 // * x-3
X+2*x-9 = 0
X+2*x-9 = 0 // - X-9
2*x = -(X-9) // : 2
x = (-(X-9))/2
x = (9-X)/2
x = (9-X)/2
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