how to factorize 6x saqured - xy-2y squared
4x^2 + 4x - 168 = 0
5x^2 + 15x - 50 = 0
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3x^2 + 18x + 27 = 0
x^2 + 9x + 18 = 0
x^2 + 12x + 36 = 0
x^2 - 8x + 7 = 0
x^2 - 2x - 35 = 0