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contoh :
|-2 - 3| = |-2| + |-3|
|-5| = 2 + 3
5 = 5 → benar
|2 + 3| = |2| + |3|
|5| = 2 + 3
5 = 5 → benar
jika salah satunya negatif :
|-2 + 3| = |-2| + |3|
|1| = 2 + 3
1 = 5 → salah