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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
92/x = 100/40 // - 100/40
92/x-(100/40) = 0
92/x-5/2 = 0
92*x^-1 = 5/2 // : 92
x^-1 = 5/184
-1 < 0
1/(x^1) = 5/184 // * x^1
1 = 5/184*x^1 // : 5/184
184/5 = x^1
x = 184/5
x = 184/5
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