помогите решить двойные неравенства:
1) -2<3x+1<7 2) 2<5x-3<17
3) 3<7-4x<15 4)-12<2(x+3)<4
1) -2<3x+1<7 2) 2<5x-3<17
3) 3<7-4x<15 4)-12<2(x+3)<4
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-2<3x+1<7-3<3x<6
-1<x<2
2<5x-3<17
5<5x<20
1<x<4
3<7-4x<15
-4<-4x<8
-8<4x<4
-2<x<1
-12<2(x+3)<4
-6<x+3<2
-9<x<-1