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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*(87/x) = 3.8 // - 3.8
2*(87/x)-3.8 = 0
174*x^-1 = 3.8 // : 174
x^-1 = 0.02183908
-1 < 0
1/(x^1) = 0.02183908 // * x^1
1 = 0.02183908*x^1 // : 0.02183908
45.78947465 = x^1
x = 45.78947465
x = 45.78947465
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