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28 = 15 + 20 - n (di luar kurung ada minus, jadi yang minusnya itu minus satu dan dikaliin sama -20 dan n jadi 20 - n).
28 - 35 = - n
- 7 = - n
n = 7
15 + 20 - 7 = 15 + 20 - n
n = 15 + 20 - 15 -20 + 7
n = 7