$(7 x - 21 y)$ is expanded form of______.

7 x - 3 y

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7 (x - 3 y)

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3 (x - 7 y)

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3 (7 x - y)

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Solution

The correct option is B $7 (x - 3 y)$
Taking 7 as common we can rewrite the expression as follows:
$7 x - 21 y$ = $7 (x - 3 y)$

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