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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
85/x = 53.8 // - 53.8
85/x-53.8 = 0
85*x^-1 = 53.8 // : 85
x^-1 = 0.63294118
-1 < 0
1/(x^1) = 0.63294118 // * x^1
1 = 0.63294118*x^1 // : 0.63294118
1.57992564 = x^1
x = 1.57992564
x = 1.57992564
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