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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) = 1/4 // - 1/4
x/(x-3)-(1/4) = 0
x/(x-3)-1/4 = 0
(4*x)/(4*(x-3))+(-1*(x-3))/(4*(x-3)) = 0
4*x-1*(x-3) = 0
3*x+3 = 0
(3*x+3)/(4*(x-3)) = 0
(3*x+3)/(4*(x-3)) = 0 // * 4*(x-3)
3*x+3 = 0
3*x+3 = 0 // - 3
3*x = -3 // : 3
x = -3/3
x = -1
x = -1
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