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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/x+6 = 5/4 // - 5/4
25/x-(5/4)+6 = 0
25/x-5/4+6 = 0
25*x^-1 = -19/4 // : 25
x^-1 = -19/100
-1 < 0
1/(x^1) = -19/100 // * x^1
1 = -19/100*x^1 // : -19/100
-100/19 = x^1
x = -100/19
x = -100/19
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