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x^2 + 7x - 7x - 49 = x^2 - 49
2ab - 6a + 6b - 18
3x^2 + 9x - 33x - 99 = 3x^2 - 24x - 99
35ab - 35a + 35b - 35
x^2 + 4x + 9x + 36 = x^2 + 13x + 36