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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 10/25 // - 10/25
6/x-(10/25) = 0
6/x-2/5 = 0
6*x^-1 = 2/5 // : 6
x^-1 = 1/15
-1 < 0
1/(x^1) = 1/15 // * x^1
1 = 1/15*x^1 // : 1/15
15 = x^1
x = 15
x = 15
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