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p*[c*(x+y) + (1-c)*x] + (1-p)*b*[c*(-y) + (1-c)*x] where b = (-p*y)/[(p-1)*(x+y)]
p*[c*(x+y) + (1-c)*x] + (1-p)*b*[c*(-y) + (1-c)*x] where b = (-p*y)/[(p-1)*(x+y)]
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