solve (x * y)/2 = 5 , ((x -y)* z)/2 = 4 , ((x -y)* x)/2 = A+4 , x* z/2 = Asolve (x * y)/2 = 5 , ((x -y)* z)/2 = 4 , ((x -y)* x)/2 = A+4 , x* z/2 = A

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