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3|1-x|=9 /:3
|x-1|=3
x-1=3 v x-1=-3
x=4 v x=-2
b)
|x+4|<5
m.z. x=-4
-4-5=-9
-4+5=1
x∈(-9,1)
c)
|x+2|>3
m.z. -2
-2-3=-5
-2+3=1
x∈(-∞,-5) u (1,+∞)