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m² + mn - mn - n²
m(m + n) - n(m + n)
(m - n)(m + n)
100 - 9b²
100 + 30b - 30b - 9b²
10(10 + 3b) - 3b(10 + 3b)
(10 - 3b)(10 + 3b)
36x² - 121
36x² + 66x - 66x - 121
6x(6x + 11) - 11(6x + 11)
(6x - 11)(6x + 11)
36x³ - y²
36x³ + 6xy - 6xy - y²
[x(6x)] (6x + y) - y(6x + y)
[x(6x - y)] (6x + y)
4a² - 49b
(4a² + 14a - 14a - 49)b
2a(2a + 7) - [7(2a + 7)] b
(2a - 7)[(2a + 7)b]