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0 < x - 3 < 3
3 < x < 6
atau
0 < -(x-3) < 3
0 < -x + 3 < 3
0 - 3 < -x < 3 - 3
-3 < -x < 0
3 < x < 0
(dibalik biar enak dilihat jadi)
0 < x < 3
Jadi, HP = {x | 0 < x < 3 atau 3 < x < 6}
Kata guru saya sih gini, persis sama soalnya.