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-5x²-x²-2x+4x+7-3>0
-6x²+2x+4 >0 /:(-2)
3x²-x-2 <0
3x²-3x+2x-2 <0
3x(x-1)+2(x-1)<0
(x-1)(3x+2)<0
m.z. x=1 v x=-2/3
_____-2/3______1______>
+ + 0 _ _ 0 + +
Odp. x∈(-2/3, 1)