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x^2 - x(3a+b) - x(a+3b) + (a+3b)(3a+b)
x^2 - (3a+b+a+3b)x + (3a^2 + ab + 9ab + 3b^2)
x^2 - 4(a+b)x + 3a^2 + 3b^2 + 10b