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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
20 = 100/(x-5) // - 100/(x-5)
20-(100/(x-5)) = 0
20-100*(x-5)^-1 = 0
20-100/(x-5) = 0
(20*(x-5))/(x-5)-100/(x-5) = 0
20*(x-5)-100 = 0
20*x-200 = 0
(20*x-200)/(x-5) = 0
(20*x-200)/(x-5) = 0 // * x-5
20*x-200 = 0
20*x-200 = 0 // + 200
20*x = 200 // : 20
x = 200/20
x = 10
x = 10
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