book Maths Puzzle Numerical Ability

How do I divide

18x^2y - 9x + 6y^2 by 3xy

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book Other Question

okay, i have one simple question because i left my math book at home :X
3 / x+1 - 3/x-1

I know you must first change the subtract to add, and make the 3 negativ My question is : A southbound bus left Frot Walton Beach at 9AM. 2 hours later a northbound bus left the same station. If the buses traveled at the same rate & were 352 kilometer