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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7.9/x = 1/25 // - 1/25
7.9/x-(1/25) = 0
7.9/x-1/25 = 0
7.9*x^-1 = 1/25 // : 7.9
x^-1 = 0.00506329
-1 < 0
1/(x^1) = 0.00506329 // * x^1
1 = 0.00506329*x^1 // : 0.00506329
197.50004444 = x^1
x = 197.50004444
x = 197.50004444
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