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a2=a1+2=-5+2=-3
a3=-3+2=-1
a4=1
a5=3
||x-1|-3|=2
|x-1|-3=-2 v |x-1|-3=2
|x-1|=1 v |x-1|=5
x-1 = -1 v x-1 = 1 v x-1 = -5 v x-1 = 5
x={-4 ; 0 ; 2 ; 6 }