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-3x+5+6x+12≤0
3x≤-17
x≤-17/3
x≤-5 2/3
x∈(-∞,-5 2/3>
-3x+5+6x+12≤0
3x≤-17 I:3
x≤-5 2/3
-3x+5+6x+12<0
3x<-17
x<-17/3
wszędzie kreska pod <