equation question and a minimum question doubt

[Hari Haran]

q51if x=(a+b)/(a-b) y=(c+a)/(b-c) z=(c+a)/(c-a)

then the value of {(2x-2)(4y+4)(z+1)}/{(x-1)(y-1)(z-1)} = ?

q52  y=min{(x+7),(5-x)} if x belongs to real numbers then the value of y is ?

 

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