subtract 4m²n + mn - 10 from 6m²n - mn +4
it's urgent
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6m²n-mn+4 - (4m²n+mn-10)
= 6m²n-mn+4 -4m²n-mn+10
= 6m²n-4m²n-mn-mn+4+10
= 2m²n-2mn+14
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