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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.5/x = 71/80 // - 71/80
1.5/x-(71/80) = 0
1.5/x-71/80 = 0
1.5*x^-1 = 71/80 // : 1.5
x^-1 = 0.59166667
-1 < 0
1/(x^1) = 0.59166667 // * x^1
1 = 0.59166667*x^1 // : 0.59166667
1.69014084 = x^1
x = 1.69014084
x = 1.69014084
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