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�) (m-n)/(n-m);

�) 2(x-y)/x(y-x);

�) (a^2 (a-2))/a(2-a);

�) (x^2 (c-x))/cx(x-c);

�) (a(a-3)^2)/(b(3-a)^2 );

�) (b^2 c(b-c))/(bc(c-b)^2 );

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