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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8 = (78-(2*(x-1)))/x // - (78-(2*(x-1)))/x
8-((78-(2*(x-1)))/x) = 0
8-((78-2*(x-1))/x) = 0
(-1*(78-2*(x-1)))/x+8 = 0
(-1*(78-2*(x-1)))/x+(8*x)/x = 0
8*x-1*(78-2*(x-1)) = 0
10*x-80 = 0
(10*x-80)/x = 0
(10*x-80)/x = 0 // * x
10*x-80 = 0
10*x-80 = 0 // + 80
10*x = 80 // : 10
x = 80/10
x = 8
x = 8
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