Factorise:-
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Step-by-step explanation:
6m² - 5mn - 21n² - 5mn
∴ 6m² - mn - 21n²
∴ 6m² - 126mn + mn - 21n²
∴ 6m ( m - 21n) + n( m- 21n)
∴ (m - 21n) (6m + n) = 0
∴ (m - 21n) = 0 or (6m +n) = 0
∴ m = 21n or 6m = n
⇒ m/n = 21 or m/n = 1/6
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