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Resolved (for now): This post reached score +5 which shows at least some consensus on the issue, so I went ahead and removed all occurrences of the tag.
The tag linear-system has been created recently, most likely in this question: Resolution of a linear system and optimization problem.
A...
I feel that a lot of questions have fast and slow ways of solving them, especially questions about number theory and algebra. Could this tag be created to narrow down answers and create a separate category of questions?
