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