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Verified answer
|x+7|<9✐ x+7 < 9
x < 9-7
x < 2
✐ -(x+7) < 9
-x - 7 < 9
-x < 9+7
-x < 16
x > -16
HP = {-16 < x < 2}
* x+7<9
= x<9-7
= x<2
* -x-7<9
= -x<9+7
= -x<16
= x>-16
HP={-16<x<2}
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