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