a²b² -ab+abc -c = ab(ab-1)+c(ab-1) = (ab-1)(ab+c)
2(m²-n²)+(m-n)(m+n) = 2(m²-n²)+(m²-n²) = 3(m²-n²)
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a²b² -ab+abc -c = ab(ab-1)+c(ab-1) = (ab-1)(ab+c)
2(m²-n²)+(m-n)(m+n) = 2(m²-n²)+(m²-n²) = 3(m²-n²)