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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)
100 = 10/(x-4) // - 10/(x-4)
100-(10/(x-4)) = 0
100-10*(x-4)^-1 = 0
100-10/(x-4) = 0
(100*(x-4))/(x-4)-10/(x-4) = 0
100*(x-4)-10 = 0
100*x-410 = 0
(100*x-410)/(x-4) = 0
(100*x-410)/(x-4) = 0 // * x-4
100*x-410 = 0
100*x-410 = 0 // + 410
100*x = 410 // : 100
x = 410/100
x = 41/10
x = 41/10
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