exam Maths Puzzle Numerical Ability

Simplify a^2-(2a-ab)-a(3b+a)

If anyone can help i would appriciate it please.

Thanks

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exam Other Question
Find the LCM of 14a^2b^3 and 21ab^4



Please help me because I am confused!Thanks 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