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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
92.8/x = 100 // - 100
92.8/x-100 = 0
92.8*x^-1 = 100 // : 92.8
x^-1 = 1.07758621
-1 < 0
1/(x^1) = 1.07758621 // * x^1
1 = 1.07758621*x^1 // : 1.07758621
0.928 = x^1
x = 0.928
x = 0.928
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