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untuk x > 0, maka |x| = x
x < 4
untuk x < 0, maka |x| = -x
-x < 4. (kalikan dengan -1)
x > -4
HP = { x | -4 < x < 4, x € Real }
-x < 4
x > -4
HP { -4 , 4 }
-4 < x < 4