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y = 3x² - 6x + 7
dy = (6x - 6) dx
dy/dx = 6x - 6
0 = 6x - 6
6x = 6
x = 1
subtitusi x = 1
y = 3x²-6x+7
y = 3.(1)² - 6.(1) + 7
y = 3 - 6 + 7
y = 4