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Let a,b,x,ya,b,x,ya,b,x,y be real numbers such that a2+b2=81a^2 +b^2 =81a2+b2=81, x2+y2=121x^2 + y^2 = 121x2+y2=121 and ax+by=99ax+by=99ax+by=99.
Then what is the set of all possible values of ay−bxay-bxay−bx?
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