book Maths Puzzle Numerical Ability

simplify:

x^2+x-12
----------------
2x^2-5x-3

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book Other Question

A quantity, its 2/3, its 1/2 ,and its 1/7 , added together, become 9. What is the quantity?


A) 42/97 B)197/42 C) 873/42 D)378/55



If possible please show me how to do a problem like this.
I need to factor out, relative to the integers, all factors common to all terms.
How do I do this??