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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
77.6 = 97/x // - 97/x
77.6-(97/x) = 0
77.6-97*x^-1 = 0
-97*x^-1 = -77.6 // : -97
x^-1 = 0.8
-1 < 0
1/(x^1) = 0.8 // * x^1
1 = 0.8*x^1 // : 0.8
1.25 = x^1
x = 1.25
x = 1.25
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