book Maths Puzzle Numerical Ability

How do I find the partial fraction decomposition of 7-8x/x2-x-2

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book Other Question

please make it clear how i open the brackets best thanx
17-(13x-(15-19x)-21x)=25-((11x-23)-(18x-7)) please help and show me the steps for this equation

2(y-5)+6y+4=62