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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.8/x = 0.625 // - 0.625
1.8/x-0.625 = 0
1.8*x^-1 = 0.625 // : 1.8
x^-1 = 0.34722222
-1 < 0
1/(x^1) = 0.34722222 // * x^1
1 = 0.34722222*x^1 // : 0.34722222
2.88000002 = x^1
x = 2.88000002
x = 2.88000002
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