exam Maths Puzzle Numerical Ability

16y<-64

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exam Other Question

Please help me solve this problem, the problem states to solve: 6x^2+13x-5=0 How to simplify this expression?
(2m+3n/2m^2-5mn-12n^2)/(2m^2-7mn-4n^2/m^2-8mn+16n^2)