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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-(3/5) = 12 // - 12
3/x-(3/5)-12 = 0
3/x-3/5-12 = 0
3*x^-1 = 63/5 // : 3
x^-1 = 21/5
-1 < 0
1/(x^1) = 21/5 // * x^1
1 = 21/5*x^1 // : 21/5
5/21 = x^1
x = 5/21
x = 5/21
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