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D( x )
x-0.5 = 0
x-0.5 = 0
x-0.5 = 0
x-0.5 = 0 // + 0.5
x = 0.5
x in (-oo:0.5) U (0.5:+oo)
0.3/(x-0.5) = 1 // - 1
0.3/(x-0.5)-1 = 0
0.3/(x-0.5)+(-1*(x-0.5))/(x-0.5) = 0
0.3-1*(x-0.5) = 0
0.8-x = 0
(0.8-x)/(x-0.5) = 0
(0.8-x)/(x-0.5) = 0 // * x-0.5
0.8-x = 0
0.8-x = 0 // - 0.8
-x = -0.8 // * -1
x = 0.8
x = 0.8
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