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3+9<6x-9+9 ≤ 15+9
12<6x≤24 (÷6)
12÷6 < 6x/6 ≤24/6
2<x ≤ 4
Rpta: Cs=<2;4]
1<1/2-6x≤10 ( -1/2)
1/2<-6x≤19/2 (÷-6)
1/2÷-6 < -6x/-6≤19/2 ÷-6
-1/12 < x ≤ -19/12
Rpta: Cs= <-1/12 ; -19/12]