exam Maths Puzzle Numerical Ability

Please help I am having a problem doing the division problems?
Divide.
7x^5 y^5 – 21x^4 y^4 + 14x^3 y^3 / 7x^3 y^3

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exam Other Question
Simplify a^2-(2a-ab)-a(3b+a)

If anyone can help i would appriciate it please.

Thanks is there any relation between ellipse parabola and hyperbola without showing figure how we can guess?