value of (3m-x)(x-n) - (x+n)(2(x+m)) when x = 1/6(-(n-m) - sqrt((n-m)^2-60nm))value of (3m-x)(x-n) - (x+n)(2(x+m)) when x = 1/6(-(n-m) - sqrt((n-m)^2-60nm))

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