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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = -8/3 // + -8/3
15/x-(-8/3) = 0
15/x+8/3 = 0
15*x^-1 = -8/3 // : 15
x^-1 = -8/45
-1 < 0
1/(x^1) = -8/45 // * x^1
1 = -8/45*x^1 // : -8/45
-45/8 = x^1
x = -45/8
x = -45/8
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