x + 4x + 3 < 0 5x < -3 x < - 3/5 x < - 0,6
5x<-3
x<-3/5
x∈(-∞; -3/5)
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x + 4x + 3 < 0 5x < -3 x < - 3/5 x < - 0,6
5x<-3
x<-3/5
x∈(-∞; -3/5)