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Dla
x∈(-∞;-4)
2(-x+2)+(-x-4)=9
-2x+4-x-4=9
-3x=9 / :(-3)
x=-3 ∉(-∞;-4)
brak
Dla
x∈<-4;2)
2(-x+2)+x+4=9
-2x+4+x+4=9
-x=1/*(-1)
x=-1
Dla
x∈<2;+∞)
2(x-2)+x+4=9
2x-4+x+4=9
3x=9/:3
x=3
x∈{-1;3}