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1. {s ¹ 0 }
2. { x ¹ -4 , 0 , 4 }
3. {x ¹ -2 , 0 , 2 , 6 }
4. { x ¹ 1 , 4 , 6 }
5. - 1 {x ¹ -3 , 0 , 3 }
6. {a ¹ -4 , -3 , 3 }
7. { m ¹ -7 , , 1 , 2 }