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2x²+14/3 x-4<0 /*3
6x²+14x-12<0 /:2
3x²+7x-6<0
3x^2+9x-2x-6<0
3x(x+3)-2(x+3)<0
(x+3)(3x-2)<0
m.z. x=-3, x=2/3
_____-3______2/3_____>
+ + 0 - - 0 + +
Odp. x∈{-2, -1, 0}