exam Maths Puzzle Numerical Ability

I am stuck on this problem...I found that the LCD is (a+1)(a+3) but I am not sure where to go from there. Thanks for your help!
Problem: (solve)
(3a-5/a^2+4a+3)+(2a+2/a+3)=(a-3/a+1)

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exam Other Question
If x+p is a factor of ax*+bx+3, show that p(b-ap)=3. Find the value of x in logx + 1/logx = 5/2