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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 2 - No. 38)

Which expression is equivalent to 14m - 21n when factorized?
7(2m - 3n)
2(7m - 21n)
3(14m - 7n)
14(m - 21n)

Explanation

14m - 21n = 7(2m-3n)

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