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D( x )
x = 0
x-4 = 0
x = 0
x = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:0) U (0:4) U (4:+oo)
10/x = 18/(x-4) // - 18/(x-4)
10/x-(18/(x-4)) = 0
10/x-18*(x-4)^-1 = 0
10/x-18/(x-4) = 0
(-18*x)/(x*(x-4))+(10*(x-4))/(x*(x-4)) = 0
10*(x-4)-18*x = 0
-8*x-40 = 0
(-8*x-40)/(x*(x-4)) = 0
(-8*x-40)/(x*(x-4)) = 0 // * x*(x-4)
-8*x-40 = 0
-8*x-40 = 0 // + 40
-8*x = 40 // : -8
x = 40/(-8)
x = -5
x = -5
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