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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
144/x = 3/4 // - 3/4
144/x-(3/4) = 0
144/x-3/4 = 0
144*x^-1 = 3/4 // : 144
x^-1 = 1/192
-1 < 0
1/(x^1) = 1/192 // * x^1
1 = 1/192*x^1 // : 1/192
192 = x^1
x = 192
x = 192
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