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Mar15-09, 03:41 PM
If a=-b adn b=-d, then my above function satisfies for all a - that's good enough, yes?
It does, but its not the most general solution...which is what you are looking for.
(3a+c) = -(3d+b) = 0 does
mean that a=-b and b=-d....the
requirement is that c=-3a and b=-3d.