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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
20 = (1*1.6)/(x-6) // - (1*1.6)/(x-6)
20-((1*1.6)/(x-6)) = 0
20-1.6*(x-6)^-1 = 0
20-1.6/(x-6) = 0
(20*(x-6))/(x-6)-1.6/(x-6) = 0
20*(x-6)-1.6 = 0
20*x-121.6 = 0
(20*x-121.6)/(x-6) = 0
(20*x-121.6)/(x-6) = 0 // * x-6
20*x-121.6 = 0
20*x-121.6 = 0 // + 121.6
20*x = 121.6 // : 20
x = 121.6/20
x = 6.08
x = 6.08
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