Answer: \(m = 0\) or \(m = 3\)
\[7m^2 - 21m = 0\]\[7m(m - 3) = 0\]\(7m = 0\) gives \(m = 0\); \(m - 3 = 0\) gives \(m = 3\). (Do not divide by \(m\), or the root 0 is lost.)
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· 24 Oct 2026
AI-verified · Oct 2026
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