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-(x+1)-(x-2)=3
-x-1-x+2=3
-2x=2
x=-1 ∉D
Dla x∈<-1,2)
x+1-x+2=3
0=0
x∈<-1,2)
Dla x≥2
x+1+x-2=3
2x=4
x=2
Odp. x∈<-1,2>