83.
{3}
{−4,−2}
{−1, 2, 3, 6}
{−4,−3, 0, 1}
85. {13, 3}
87. {−6, 6}
93. |x−4|<3
95. |x−4|≤6
97. |x−7|>4
99. |2x−5|≥15
101. |2x−a−b|<b−a
103. |2x−a−b|>b−a
105. |x−39|≤31
107. [−1, 1]∪[3, 5]
109. (−∞,−1]∪[7, ∞)
111. (−2,−12]
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