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D( x )
x-2 = 0
x = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x = 0
x = 0
x in (-oo:0) U (0:2) U (2:+oo)
50/x-(50/(x-2)) = 4/x // - 4/x
50/x-(50/(x-2))-(4/x) = 0
50/x-50*(x-2)^-1-4*x^-1 = 0
50/x-50/(x-2)-4/x = 0
(-50*x)/(x*(x-2))+(50*(x-2))/(x*(x-2))+(-4*(x-2))/(x*(x-2)) = 0
50*(x-2)-4*(x-2)-50*x = 0
8-4*x-100 = 0
-4*x-92 = 0
(-4*x-92)/(x*(x-2)) = 0
(-4*x-92)/(x*(x-2)) = 0 // * x*(x-2)
-4*x-92 = 0
-4*x-92 = 0 // + 92
-4*x = 92 // : -4
x = 92/(-4)
x = -23
x = -23
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