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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.8/x = 33.8 // - 33.8
1.8/x-33.8 = 0
1.8*x^-1 = 33.8 // : 1.8
x^-1 = 18.77777778
-1 < 0
1/(x^1) = 18.77777778 // * x^1
1 = 18.77777778*x^1 // : 18.77777778
0.05325444 = x^1
x = 0.05325444
x = 0.05325444
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