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x² +(x-4)² -8x - 8(x -4) + 24= 0
x²+x²-8x+16-8x-8x+32+24 =0
2x² - 24x + 72 = 0
x²-12x + 36= 0
(x -6)² = 0
x= 6 --> y = x - 4
y = 6-4
y = 2
titik singgung di (x,y)= (6,2)