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W (3) = 27a - 18 - 24 - 12 = 0
27a - 54 = 0
27 a = 54
a = 2
odp. 2x³ - 2x² - 8x - 12
0=a3^3-2*3^2-8*3-12
0=27a-18-24-12
27a=54 /:27
a=2