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-3<x-4<3
x-4<3 x-4>-3
x<7 x>1
x∈(1;7)
b) |x+1| 2
-2 x+1 2
x+1 2 x+1 ≥ -2
x ≤ 1 x ≥ -3
x∈<-3;1>
c) |x-2|>0
x-2>0 x-2<0
x>2 x<2
x∈R\{2}