exam Maths Puzzle Numerical Ability

how do you solve 8y^2-12y+4=y+10

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Of all failures of a certain of computer hard drive, it is determined that 20% of them only the sector containing the file allocation table is damaged, in 70% of them only nonessen verify that (2x+1)/x-1 is the inverse of x+1/x-2 . I only got to x= y+1/y-2 and got stuck on how to simplify.