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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.5 = 9.3/x // - 9.3/x
1.5-(9.3/x) = 0
1.5-9.3*x^-1 = 0
-9.3*x^-1 = -1.5 // : -9.3
x^-1 = 0.16129032
-1 < 0
1/(x^1) = 0.16129032 // * x^1
1 = 0.16129032*x^1 // : 0.16129032
6.2000001 = x^1
x = 6.2000001
x = 6.2000001
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