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