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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) = 41 // - 41
4/(x-4)-41 = 0
4/(x-4)+(-41*(x-4))/(x-4) = 0
4-41*(x-4) = 0
168-41*x = 0
(168-41*x)/(x-4) = 0
(168-41*x)/(x-4) = 0 // * x-4
168-41*x = 0
168-41*x = 0 // - 168
-41*x = -168 // : -41
x = -168/(-41)
x = 168/41
x = 168/41
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