5mn-2m+8m,6mn-2n+6m-5,-6mn-2m-2n
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5M(n-2),2n(3m-1),-2n(3m+1
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(5mn-2m+8m)+(6mn-2n+6m-5)+(-6mn-2m-2n)
=5mn+6m+6m-2m-4n-5
=5mn+10m-4n-5
=5mn+6m+6m-2m-4n-5
=5mn+10m-4n-5
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