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(y+4)² +y² - 8(y+4) - 8y + 24 = 0
y² + 8y + 16 + y² -8y - 32 - 8y + 24 = 0
2y² - 8y +8 = 0
y² - 4y + 4 = 0
(y-2)² = 0
y = 2 --> x = y+ 4 --> x = 2+4
x= 6
titik singgung (x,y) = (6,2)