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-x-3-x=3
-2x=3+3 /:(-2)
x=-3 ∉ D
Dla -3≤x<0
x+3-x=3
3=3 tozsamosc
Dla x≥0
x+3+x=3
2x=3-3
x=0
Odp. x∈<-3,0>