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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
143/x = 95.7 // - 95.7
143/x-95.7 = 0
143*x^-1 = 95.7 // : 143
x^-1 = 0.66923077
-1 < 0
1/(x^1) = 0.66923077 // * x^1
1 = 0.66923077*x^1 // : 0.66923077
1.49425287 = x^1
x = 1.49425287
x = 1.49425287
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