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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10 = 1.5/x // - 1.5/x
10-(1.5/x) = 0
10-1.5*x^-1 = 0
-1.5*x^-1 = -10 // : -1.5
x^-1 = 6.66666667
-1 < 0
1/(x^1) = 6.66666667 // * x^1
1 = 6.66666667*x^1 // : 6.66666667
0.15 = x^1
x = 0.15
x = 0.15
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