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4. Factorise by taking out the common factor

Factorise the expression

$9x^5y^3 + 6x^3y^2 - 18x^2y$ by taking out the common factor:

$4x^2y(10x^3y^2 + 2xy - 5)$
$2x^2y(2x^3y^2 + 3xy + 6)$
$3x^2y(3x^3y^2 + 2xy - 6)$
$3x^2y(3x^3y^2 - 2xy + 6)$

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