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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
80 = 1/x-1.2 // - 1/x-1.2
1.2-(1/x)+80 = 0
1.2-x^-1+80 = 0
-1*x^-1 = -81.2 // : -1
x^-1 = 81.2
-1 < 0
1/(x^1) = 81.2 // * x^1
1 = 81.2*x^1 // : 81.2
0.01231527 = x^1
x = 0.01231527
x = 0.01231527
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