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|x-8| = 1
x-8 = 1 v x-8 = -1
x =8+1 v x = 8-1
x=9 v x= 7
b)
|x-5|>3
x-5 > 3 v x-5 < -3
x>5+3 v x < 5-3
x > 8 v x < 2
x∈(-∞,2) u (8,+∞)