exam Maths Puzzle Numerical Ability

I need to slove by completing the square
m^2-1/2 m=7/2

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exam Other Question

Hello out there,I need some help with some problems,the first one is,Solve 6/x+2=2/x-4.The next one is,Solve 3/x+4-1/x=1/x.The third one is,Solve x/5=x+4/9.And the last one is,Solve 1/2x+1/x=3/8,thanks to whoever can help. A dishonest shopkeeper professes to sell pulses at the cost price, but he uses a false weight of 950gm for a kg. His gain is ------- %.
(a) 0 % (b) 5 .3 % (c) 3.1% (d) none