3<7-4x<15
3-7<-4x<15-7
-4<-4x<8
-4:(-4)>x>8:(-4)
1>x>-2
-2<x<1
x∈(-2;1)
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3<7-4x<15
3-7<-4x<15-7
-4<-4x<8
-4:(-4)>x>8:(-4)
1>x>-2
-2<x<1
x∈(-2;1)