exam Maths Puzzle Numerical Ability

(x)/(x^2+9x+20) - (4)/(x^2+7x+12) I am having trouble with this problem.

Thanks for any help
Rhee

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exam Other Question

Here is the question: ESP Experiment: Cards with 5 different symbols. In this experiment the "sender" draws randomly a card and concentrates on it. The "receiver" tries to determin Simplify the expression:

2[12-3(4+2)]