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x₁x + y₁y + (A/2)(x + x₁) + (B/2)(y + y₁) + C = 0
2x + 5y + (2/2)(x + 2) + (-10/2)(y + 5) + 17 = 0
2x + 5y + x + 2 - 5y - 25 + 17 = 0
3x - 6 = 0