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D( x )
x-81 = 0
x-81 = 0
x-81 = 0
x-81 = 0 // + 81
x = 81
x in (-oo:81) U (81:+oo)
96/(x-81) = 8 // - 8
96/(x-81)-8 = 0
96/(x-81)+(-8*(x-81))/(x-81) = 0
96-8*(x-81) = 0
744-8*x = 0
(744-8*x)/(x-81) = 0
(744-8*x)/(x-81) = 0 // * x-81
744-8*x = 0
744-8*x = 0 // - 744
-8*x = -744 // : -8
x = -744/(-8)
x = 93
x = 93
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