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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
4/(x-4) = x/(x-4)-(4/3) // - x/(x-4)-(4/3)
4/(x-4)-(x/(x-4))+4/3 = 0
4/(x-4)+(-1*x)/(x-4)+4/3 = 0
(3*4)/(3*(x-4))+(-1*3*x)/(3*(x-4))+(4*(x-4))/(3*(x-4)) = 0
4*(x-4)-1*3*x+3*4 = 0
4*x-3*x-16+12 = 0
x-4 = 0
(x-4)/(3*(x-4)) = 0
(x-4)/(3*(x-4)) = 0 // * 3*(x-4)
x-4 = 0
x-4 = 0 // + 4
x = 4
x in { 4}
x belongs to the empty set
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