exam Maths Puzzle Numerical Ability

Can you please help me with this problem?

Divide
(x^2-9y^2/7x^2-21y)/x^2+3xy

Thanks so much!

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exam Other Question

radical 18x^10y
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(4x2y-1)-2 squared
over
(3x-1y)

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(2x-1y2)cubed
over
(9x-2y2)