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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+7/y = 0
6*x^-1 = -(7*y^-1) // : 6
x^-1 = (-7*y^-1)/6
-1 < 0
1/(x^1) = (-7*y^-1)/6 // * x^1
1 = x^1*((-7*y^-1)/6) // : (-7*y^-1)/6
(-6*y)/7 = x^1
x = (-6*y)/7
x = (-6*y)/7
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