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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/8.5 = 32/x // - 32/x
11/8.5-(32/x) = 0
11/8.5-32*x^-1 = 0
-32*x^-1 = -1.29411765 // : -32
x^-1 = 0.04044118
-1 < 0
1/(x^1) = 0.04044118 // * x^1
1 = 0.04044118*x^1 // : 0.04044118
24.72727057 = x^1
x = 24.72727057
x = 24.72727057
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