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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
45/x = 12/5 // - 12/5
45/x-(12/5) = 0
45/x-12/5 = 0
45*x^-1 = 12/5 // : 45
x^-1 = 4/75
-1 < 0
1/(x^1) = 4/75 // * x^1
1 = 4/75*x^1 // : 4/75
75/4 = x^1
x = 75/4
x = 75/4
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