-7i > -21u
7i < 21 u
i < 3u
When matters get out of hand, I would unleash my arsenal of "Whys" at myself to find the root of the cause(s). Thereafter, it's one's choice to act upon and eliminate or dampen the effects.
No, don't get me wrong. The equation above was chanced upon from a text and I'm using it as an instance.