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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9.8/x = 2.8/5.4 // - 2.8/5.4
9.8/x-(2.8/5.4) = 0
9.8/x-0.51851852 = 0
9.8*x^-1 = 0.51851852 // : 9.8
x^-1 = 0.05291005
-1 < 0
1/(x^1) = 0.05291005 // * x^1
1 = 0.05291005*x^1 // : 0.05291005
18.90000104 = x^1
x = 18.90000104
x = 18.90000104
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