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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
91/x-5.7 = 1.4 // - 1.4
91/x-5.7-1.4 = 0
91*x^-1 = 7.1 // : 91
x^-1 = 0.07802198
-1 < 0
1/(x^1) = 0.07802198 // * x^1
1 = 0.07802198*x^1 // : 0.07802198
12.81690108 = x^1
x = 12.81690108
x = 12.81690108
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