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Persamaan garis singgung x^2 + y^2 - 2x + 4y - 20 = 0 dititik (5,1)
5x + 1y - 2/2 (x + 5) + 4/2 (y + 1) - 20 = 0
5x + y - x - 5 + 2y + 2 - 20 = 0
4x + 3y - 23 = 0