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-(2x+4)+x-1=3
-2x-4+x-1=3
-x=3+5
x=-8
dla -2≤x<1
2x+4+x-1=3
3x=6
x=2∉ D
dla x≥1
2x+4-x+1=3
x=3-3
x=0
Odp. x∈{-8,0}