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a)A={x∈R:2x-4<0}
x<2
x∈(-∞,2)
B={x∈R:-3x≤12}
x≥-4
x∈<-4,∞)
C=<0;6)
b)
A n B=<-4,2)
A\B=(-∞,-2)
AuC=(-∞,6)
(A u C) n B =<-4,6)