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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
19/x = 25/100 // - 25/100
19/x-(25/100) = 0
19/x-1/4 = 0
19*x^-1 = 1/4 // : 19
x^-1 = 1/76
-1 < 0
1/(x^1) = 1/76 // * x^1
1 = 1/76*x^1 // : 1/76
76 = x^1
x = 76
x = 76
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