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(x-4)(x-2) = x^2 - 2x - 4x + 8
x^2 + 5x + 3x + 15 - (x^2 -2x - 4x + 8)
x^2 + 5x + 3x + 15 - x^2 + 2x + 4x -8 = 0 (B)