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x∈{-2, 1, 2, 4}
2(x-1)³(x+2)²(4-x)^4(14-7x)≥0
______-2_____1____2____4_____>x
_ _ 0 _ _ 0 + + 0 _ _ 0 _ _
Odp. x∈{ {-2} u <1,2> u {4}}